[CLIENT] Not being able too make item sets

I'm not able too make any itemsets at the moment. As soon as im trying to drag and drop items in the designated place it just doesnt work. I've seen people getting a black line on the place where the item should be dropped but its not even showing that line. Its like i just cant interact with the place too drop the items.

(Have been looking for an answer pretty long, couldnt find it, sorry if repost)