diff --git a/apps/server/src/core/base/processors/base-queue.processor.ts b/apps/server/src/core/base/processors/base-queue.processor.ts
index 27918eb8c..6bf623036 100644
--- a/apps/server/src/core/base/processors/base-queue.processor.ts
+++ b/apps/server/src/core/base/processors/base-queue.processor.ts
@@ -8,6 +8,8 @@ import { executeTx } from '@docmost/db/utils';
 import { BaseRowRepo } from '@docmost/db/repos/base/base-row.repo';
 import { BasePropertyRepo } from '@docmost/db/repos/base/base-property.repo';
 import { BaseRepo } from '@docmost/db/repos/base/base.repo';
+import { BasePropertyService } from '../services/base-property.service';
+import { BasePropertyTypeValue } from '../base.schemas';
 import { QueueJob, QueueName } from '../../../integrations/queue/constants';
 import {
   IBaseCellGcJob,
@@ -39,6 +41,7 @@ export class BaseQueueProcessor
     private readonly baseRowRepo: BaseRowRepo,
     private readonly basePropertyRepo: BasePropertyRepo,
     private readonly baseRepo: BaseRepo,
+    private readonly basePropertyService: BasePropertyService,
     private readonly eventEmitter: EventEmitter2,
     private readonly formulaLock: FormulaLockService,
   ) {
@@ -95,6 +98,13 @@ export class BaseQueueProcessor
           schemaVersion,
           data.actorId,
         );
+        await this.basePropertyService.clearKanbanGroupingIfNotGroupable(
+          data.pageId,
+          data.propertyId,
+          data.toType as BasePropertyTypeValue,
+          data.workspaceId,
+          data.actorId ?? null,
+        );
         return summary;
       }
       case QueueJob.BASE_CELL_GC: {
diff --git a/apps/server/src/core/base/services/__tests__/strip-property-from-view-config.spec.ts b/apps/server/src/core/base/services/__tests__/strip-property-from-view-config.spec.ts
index d9ab7a78f..fc85e80ac 100644
--- a/apps/server/src/core/base/services/__tests__/strip-property-from-view-config.spec.ts
+++ b/apps/server/src/core/base/services/__tests__/strip-property-from-view-config.spec.ts
@@ -1,4 +1,7 @@
-import { stripPropertyFromViewConfig } from '../strip-property-from-view-config';
+import {
+  clearKanbanGroupingFromViewConfig,
+  stripPropertyFromViewConfig,
+} from '../strip-property-from-view-config';
 
 describe('stripPropertyFromViewConfig', () => {
   it('returns the config unchanged when no references exist', () => {
@@ -124,3 +127,45 @@ describe('stripPropertyFromViewConfig', () => {
     });
   });
 });
+
+describe('clearKanbanGroupingFromViewConfig', () => {
+  it("returns the config unchanged (by reference) when groupByPropertyId doesn't match", () => {
+    const config = { groupByPropertyId: 'p-other' };
+    expect(clearKanbanGroupingFromViewConfig(config, 'p-here')).toBe(config);
+  });
+
+  it('returns {} when config is null or undefined', () => {
+    expect(clearKanbanGroupingFromViewConfig(null, 'p1')).toEqual({});
+    expect(clearKanbanGroupingFromViewConfig(undefined, 'p1')).toEqual({});
+  });
+
+  it('clears kanban fields when groupByPropertyId matches', () => {
+    const result = clearKanbanGroupingFromViewConfig(
+      {
+        groupByPropertyId: 'p1',
+        hiddenChoiceIds: ['c1'],
+        choiceOrder: ['c1'],
+        sorts: [{ propertyId: 'p2', direction: 'asc' as const }],
+      },
+      'p1',
+    );
+    expect(result).toEqual({
+      sorts: [{ propertyId: 'p2', direction: 'asc' as const }],
+    });
+  });
+
+  it('preserves non-kanban fields untouched when clearing', () => {
+    const result = clearKanbanGroupingFromViewConfig(
+      {
+        groupByPropertyId: 'p1',
+        filter: { op: 'and' as const, children: [] },
+        visiblePropertyIds: ['p2'],
+      },
+      'p1',
+    );
+    expect(result).toEqual({
+      filter: { op: 'and' as const, children: [] },
+      visiblePropertyIds: ['p2'],
+    });
+  });
+});
diff --git a/apps/server/src/core/base/services/base-property.service.ts b/apps/server/src/core/base/services/base-property.service.ts
index 7997faf91..b62a0c991 100644
--- a/apps/server/src/core/base/services/base-property.service.ts
+++ b/apps/server/src/core/base/services/base-property.service.ts
@@ -17,7 +17,10 @@ import { BasePropertyRepo } from '@docmost/db/repos/base/base-property.repo';
 import { BaseRowRepo } from '@docmost/db/repos/base/base-row.repo';
 import { BaseRepo } from '@docmost/db/repos/base/base.repo';
 import { BaseViewRepo } from '@docmost/db/repos/base/base-view.repo';
-import { stripPropertyFromViewConfig } from './strip-property-from-view-config';
+import {
+  clearKanbanGroupingFromViewConfig,
+  stripPropertyFromViewConfig,
+} from './strip-property-from-view-config';
 import { CreatePropertyDto } from '../dto/create-property.dto';
 import {
   UpdatePropertyDto,
@@ -374,6 +377,13 @@ export class BasePropertyService {
         schemaVersion,
       };
       this.eventEmitter.emit(EventName.BASE_SCHEMA_BUMPED, bumpEvent);
+      await this.clearKanbanGroupingIfNotGroupable(
+        dto.pageId,
+        dto.propertyId,
+        newType,
+        workspaceId,
+        actorId ?? null,
+      );
       return this.loadAndEmit(dto, workspaceId, actorId, null);
     }
 
@@ -452,6 +462,55 @@ export class BasePropertyService {
     }
   }
 
+  /*
+   * Post-type-conversion cleanup: when a property's type flips to something
+   * not groupable (anything other than select/status), drop the kanban
+   * grouping fields from any view rooted on it. Called from BOTH the inline
+   * path here and the BullMQ processor after the pending→live swap, so
+   * `view.config` stays coherent with the property's actual type. Each
+   * touched view re-emits `base.view.updated` so other clients see it.
+   */
+  async clearKanbanGroupingIfNotGroupable(
+    pageId: string,
+    propertyId: string,
+    newType: BasePropertyTypeValue,
+    workspaceId: string,
+    actorId: string | null,
+  ): Promise<void> {
+    if (
+      newType === BasePropertyType.SELECT ||
+      newType === BasePropertyType.STATUS
+    ) {
+      return;
+    }
+    const views = await this.baseViewRepo.findByPageId(pageId, {
+      workspaceId,
+    });
+    for (const view of views) {
+      const before = (view.config ?? {}) as ViewConfig;
+      const after = clearKanbanGroupingFromViewConfig(before, propertyId);
+      if (after === before) continue;
+      await this.baseViewRepo.updateView(
+        view.id,
+        // `config` column is typed `Json` by Kysely; ViewConfig is a Zod
+        // inferred shape that isn't structurally assignable to `Json`.
+        { config: after as any },
+        { workspaceId },
+      );
+      const fresh = await this.baseViewRepo.findById(view.id, { workspaceId });
+      if (fresh) {
+        const event: BaseViewUpdatedEvent = {
+          pageId,
+          workspaceId,
+          actorId,
+          requestId: null,
+          view: fresh,
+        };
+        this.eventEmitter.emit(EventName.BASE_VIEW_UPDATED, event);
+      }
+    }
+  }
+
   private async loadAndEmit(
     dto: UpdatePropertyDto,
     workspaceId: string,
diff --git a/apps/server/src/core/base/services/strip-property-from-view-config.ts b/apps/server/src/core/base/services/strip-property-from-view-config.ts
index 3b397d069..e6f708460 100644
--- a/apps/server/src/core/base/services/strip-property-from-view-config.ts
+++ b/apps/server/src/core/base/services/strip-property-from-view-config.ts
@@ -79,3 +79,23 @@ export function stripPropertyFromViewConfig(
 
   return next as ViewConfig;
 }
+
+/*
+ * Narrower sibling of `stripPropertyFromViewConfig`. Used after a property's
+ * type changes to something no longer groupable (e.g. select → text): the
+ * property still exists, so we leave sorts/filters/visibility alone, and only
+ * clear the kanban grouping fields rooted on it. Returns the input by
+ * reference when nothing matches so callers can skip the write.
+ */
+export function clearKanbanGroupingFromViewConfig(
+  config: ViewConfig | undefined | null,
+  propertyId: string,
+): ViewConfig {
+  if (!config) return {};
+  if (config.groupByPropertyId !== propertyId) return config;
+  const next: Record<string, unknown> = { ...config };
+  delete next.groupByPropertyId;
+  delete next.hiddenChoiceIds;
+  delete next.choiceOrder;
+  return next as ViewConfig;
+}