For some reason, tonight the compendium started acting differently. Whenever I drag and drop a spell from the compendium onto the spell tab of a character sheet it also creates a handout which pops up featuring that spell's information. If it matters, I'm using the free Shaped sheet, so currently version 6.5.1. I haven't had this problem before tonight so I'm unsure what might have changed. Edit: Quick edit for some more info. This first happened when editing an NPC token. When I tried adding a spell to a player's token it did the same thing, but I also got an error on the top left which read "please select a value that is no less than 0" when clicking add to open a new spell to drag into. This error did not appear when clicking add on the NPC.