Drag and drop issue

Hello,

I have a drag and drop interaction (NOT using the drag and drop quiz), and I have a problem which I don't know how to solve-

 

a little explanation is needed first:

on the bottom of my slide there's a reset button (not player's default button, but my own). when you press it it resets all the veriables, draggable items location etc. )

on the first attempt to drag everything works fine- but after I press reset, and try to drop a different item on the same hotspot I dropped before, it suddenly shows the previous item I dropped.

here are some screenshots to clarify:

first drop:

afterwards, I press reset and drag another item to the same spot as the item before........

I tried changing the drag and drop to free and it solved the problem BUT I realy need the snap to center option.

 

I attached my project if anyone wants to have a look...

 

thanks,

Bar