diff --git a/frontend/src/app/features/team-planner/team-planner/planner/team-planner.component.ts b/frontend/src/app/features/team-planner/team-planner/planner/team-planner.component.ts
index f83ef18897..cb479f047d 100644
--- a/frontend/src/app/features/team-planner/team-planner/planner/team-planner.component.ts
+++ b/frontend/src/app/features/team-planner/team-planner/planner/team-planner.component.ts
@@ -18,7 +18,6 @@ import {
 import {
   BehaviorSubject,
   combineLatest,
-  from,
   Subject,
 } from 'rxjs';
 import {
@@ -362,9 +361,7 @@ export class TeamPlannerComponent extends UntilDestroyedMixin implements OnInit,
             // DnD configuration
             editable: true,
             droppable: true,
-            eventResize: (resizeInfo:EventResizeDoneArg) => {
-              const updater = from(this.updateEvent(resizeInfo));
-            },
+            eventResize: (resizeInfo:EventResizeDoneArg) => this.updateEvent(resizeInfo),
             eventDragStart: (dragInfo:EventDragStartArg) => {
               const { el } = dragInfo;
               el.style.pointerEvents = 'none';
@@ -408,6 +405,8 @@ export class TeamPlannerComponent extends UntilDestroyedMixin implements OnInit,
 
           this.viewLookup.destroyDetached();
 
+          this.removeExternalEvents();
+
           successCallback(events);
         },
         failureCallback,
@@ -687,4 +686,16 @@ export class TeamPlannerComponent extends UntilDestroyedMixin implements OnInit,
     this.showAddExistingPane.next(!this.showAddExistingPane.getValue());
     (this.addExistingToggle.nativeElement as HTMLElement).blur();
   }
+
+  private removeExternalEvents():void {
+    this
+      .ucCalendar
+      .getApi()
+      .getEvents()
+      .forEach((evt) => {
+        if (evt.id.includes('external')) {
+          evt.remove();
+        }
+      });
+  }
 }