Inventory Dragging Item Problem

Hello,

I am having quite an issue with my inventory system right now. I want to drag items and I want to detect if the selected item was dragged onto an actual slot or not. I created a really basic code for that which definitely needs optimization, but it should work. Well, it doesn't, and after trying to fix that weird error for about an hour, I give up. So, hopefully some of you can help me, I have no clue why the code is not working. I logged everything, but the correct result is not given.

I am looping through all the slots in the inventory. This code is used for one individual slot.

Also: If I remove the else statement, everything works fine. So the else statement is somehow triggered instead of the actual if statement.

 if (slotRect.Contains(currentEvent.mousePosition))
 {
                     if (isDragging && currentEvent.type == EventType.mouseUp)
                     {
                         Debug.Log ("In Slot."); // never reached but the contains method does work
                         database.InventoryItems[dragIndex] = database.InventoryItems[count];
                         database.InventoryItems[count] = draggedItem;
                         draggedItem = null;
                         isDragging = false;
                         return;
                     }
                 }
                 else
                 {
                     if (isDragging && currentEvent.type == EventType.mouseUp)
                     {
                         Debug.Log ("Not in Slot.");
                         database.InventoryItems[dragIndex] = draggedItem;
                         draggedItem = null;
                         isDragging = false;
                         return;
                     }
                 }