Right Click Problem

Hi Guys! I have this problem with right clicking. You see, when you click on an item it moves to an inventory slot. Now when I right click it should move it to ANOTHER slot, and it does just that, BUT all the items in the slot move, instead of just ONE. It like, selects all the objects. Is there any way to fix this? Here is a picture of my events:

<img src="https://dl.dropboxusercontent.com/u/61808535/Rightclickstuffs.png" border="0" />

Thanks!

P.S. Items overlap when in the inventory slots, do for some reason when I right click 1 of them all of them get selected.