diff --git a/src/managers/DragDropManager.ts b/src/managers/DragDropManager.ts
index 933c816..c16d48b 100644
--- a/src/managers/DragDropManager.ts
+++ b/src/managers/DragDropManager.ts
@@ -161,6 +161,7 @@ export class DragDropManager {
   private draggedClone!: HTMLElement | null;
   private currentColumn: IColumnBounds | null = null;
   private previousColumn: IColumnBounds | null = null;
+  private originalSourceColumn: IColumnBounds | null = null;  // Track original start column
   private isDragStarted = false;
 
   // Movement threshold to distinguish click from drag
@@ -360,6 +361,7 @@ export class DragDropManager {
 
     const originalElement = this.originalElement as BaseSwpEventElement;
     this.currentColumn = ColumnDetectionUtils.getColumnBounds(currentPosition);
+    this.originalSourceColumn = this.currentColumn;  // Store original source column at drag start
     this.draggedClone = originalElement.createClone();
 
     const dragStartPayload: IDragStartEventPayload = {
@@ -459,7 +461,7 @@ export class DragDropManager {
           originalElement: this.originalElement,
           draggedClone: this.draggedClone,
           mousePosition,
-          sourceColumn: this.previousColumn!!,
+          originalSourceColumn: this.originalSourceColumn!!,
           finalPosition: { column, snappedY },  // Where drag ended
           target: dropTarget
         };
@@ -625,6 +627,7 @@ export class DragDropManager {
     this.originalElement = null;
     this.draggedClone = null;
     this.currentColumn = null;
+    this.originalSourceColumn = null;
     this.isDragStarted = false;
     this.scrollDeltaY = 0;
     this.lastScrollTop = 0;
diff --git a/src/renderers/EventRendererManager.ts b/src/renderers/EventRendererManager.ts
index 037820d..6fb043d 100644
--- a/src/renderers/EventRendererManager.ts
+++ b/src/renderers/EventRendererManager.ts
@@ -161,7 +161,7 @@ export class EventRenderingService {
     private setupDragEndListener(): void {
         this.eventBus.on('drag:end', async (event: Event) => {
 
-            const { originalElement: draggedElement, sourceColumn, finalPosition, target } = (event as CustomEvent<IDragEndEventPayload>).detail;
+            const { originalElement: draggedElement, originalSourceColumn, finalPosition, target } = (event as CustomEvent<IDragEndEventPayload>).detail;
             const finalColumn = finalPosition.column;
             const finalY = finalPosition.snappedY;
             const eventId = draggedElement.dataset.eventId || '';
@@ -196,7 +196,7 @@ export class EventRenderingService {
                 }
 
                 // Re-render affected columns for stacking/grouping (now with updated data)
-                this.reRenderAffectedColumns(sourceColumn, finalColumn);
+                await this.reRenderAffectedColumns(originalSourceColumn, finalColumn);
             }
 
             // Clean up any remaining day event clones
@@ -308,29 +308,29 @@ export class EventRenderingService {
     /**
      * Re-render affected columns after drag to recalculate stacking/grouping
      */
-    private reRenderAffectedColumns(sourceColumn: IColumnBounds | null, targetColumn: IColumnBounds | null): void {
+    private async reRenderAffectedColumns(originalSourceColumn: IColumnBounds | null, targetColumn: IColumnBounds | null): Promise<void> {
         const columnsToRender = new Set<string>();
 
-        // Add source column if exists
-        if (sourceColumn) {
-            columnsToRender.add(sourceColumn.date);
+        // Add original source column if exists
+        if (originalSourceColumn) {
+            columnsToRender.add(originalSourceColumn.date);
         }
 
         // Add target column if exists and different from source
-        if (targetColumn && targetColumn.date !== sourceColumn?.date) {
+        if (targetColumn && targetColumn.date !== originalSourceColumn?.date) {
             columnsToRender.add(targetColumn.date);
         }
 
         // Re-render each affected column
-        columnsToRender.forEach(columnDate => {
-            this.renderSingleColumn(columnDate);
-        });
+        for (const columnDate of columnsToRender) {
+            await this.renderSingleColumn(columnDate);
+        }
     }
 
     /**
      * Render events for a single column by re-rendering entire container
      */
-    private renderSingleColumn(columnDate: string): void {
+    private async renderSingleColumn(columnDate: string): Promise<void> {
         // Find the column element
         const columnElement = document.querySelector(`swp-day-column[data-date="${columnDate}"]`) as HTMLElement;
         if (!columnElement) {
@@ -359,7 +359,7 @@ export class EventRenderingService {
         const endDate = this.dateService.parseISO(`${lastColumnDate}T23:59:59.999`);
 
         // Re-render entire container (this will recalculate stacking for all columns)
-        this.renderEvents({
+        await this.renderEvents({
             container,
             startDate,
             endDate
diff --git a/src/types/EventTypes.ts b/src/types/EventTypes.ts
index 45daa17..72db8be 100644
--- a/src/types/EventTypes.ts
+++ b/src/types/EventTypes.ts
@@ -40,7 +40,7 @@ export interface IDragEndEventPayload {
   originalElement: HTMLElement;
   draggedClone: HTMLElement | null;
   mousePosition: IMousePosition;
-  sourceColumn: IColumnBounds;
+  originalSourceColumn: IColumnBounds;  // Original column where drag started
   finalPosition: {
     column: IColumnBounds | null;  // Where drag ended
     snappedY: number;