diff --git a/frontend/admin/static/script.js b/frontend/admin/static/script.js
index b1a3d61..d9704a9 100644
--- a/frontend/admin/static/script.js
+++ b/frontend/admin/static/script.js
@@ -7,6 +7,7 @@ const START_HOUR = 8;
 const END_HOUR = 20;
 const PIXELS_PER_MINUTE = 0.8;
 
+let dragOffsetY = 0;
 let currentRangeStart = null;
 let scheduleItems = [];
 let itemIndex = new Map();
@@ -275,6 +276,8 @@ function toggleActiveItem(element) {
 function handleDragStart(event) {
     const block = event.currentTarget;
     block.classList.add('dragging');
+    const blockRect = block.getBoundingClientRect();
+    dragOffsetY = event.clientY - blockRect.top;
     event.dataTransfer.setData('text/plain', JSON.stringify({
         id: Number(block.dataset.id),
         occurrenceDate: block.dataset.date
@@ -295,7 +298,8 @@ async function handleEventDrop(event) {
     }
 
     const rect = event.currentTarget.getBoundingClientRect();
-    const relativeY = Math.max(0, Math.min(rect.height, event.clientY - rect.top));
+    const adjustedY = event.clientY - rect.top - dragOffsetY;
+    const relativeY = Math.max(0, Math.min(rect.height, adjustedY));
     const minutesFromStart = Math.round((relativeY / PIXELS_PER_MINUTE) / SLOT_MINUTES) * SLOT_MINUTES;
     const clampedMinutes = Math.min((END_HOUR - START_HOUR) * 60 - item.duration_min, Math.max(0, minutesFromStart));
     const newTime = minutesToTime(START_HOUR * 60 + clampedMinutes);