diff --git a/kanblendar.js b/kanblendar.js
index a633fdc..9b63a3b 100644
--- a/kanblendar.js
+++ b/kanblendar.js
@@ -255,17 +255,25 @@ class Kanblendar {
         // Update the task's due time if dropped in a time slot and the current due time is not valid for that slot
         if (dropTarget.classList.contains('kanblendar-time-slot')) {
             const startTime = dropTarget.dataset.startTime;
-            const dueTime = new Date(task.dataset.dueTime);
+
             const slotStartTime = new Date(`${this.config.currentDate}T${startTime}:00`);
             const slotEndTime = this.addMinutes(slotStartTime, this.config.interval);
 
-            if (!(dueTime >= slotStartTime && dueTime <= slotEndTime)) {
+            if (startTime) {
+                const dueTime = new Date(task.dataset.dueTime);
+
+                if (!(dueTime >= slotStartTime && dueTime <= slotEndTime)) {
+                    task.dataset.dueTime = slotStartTime.toISOString();
+                }
+            } else {
                 task.dataset.dueTime = slotStartTime.toISOString();
             }
         }
 
-        // Update the task's column in the tasks map
+
+        // Update the task in the tasks map
         this.tasks.get(task.id).column = dropTarget.id.replace('-tasks', '');
+        this.tasks.get(task.id).dueTime = task.dataset.dueTime;
 
         this.adjustTimeSlotHeights(); // Adjust heights after dropping a task
     }