Drag and Drop Inventory w/ UMG based on the Twitch Stream problem.

Hi, so I’ve been following the tutorial series to implement a drag and drop inventory using UMG. I’ve finished the videos but I have a problem where I can’t move or swap any items that are in the inventory menu. I am able to drag and drop the inventory items to the action bar where I can move and swap items there, but only on the action bar. I know that other people have had the same problem but with no apparent answer. Any help would be greatly appreciated. Thanks.