I know there are other threads about Wandering Spirit Movement bug, but this one is different:
If you use Wandering Spirit on Right Click slot and try to equip an item (pressing right click in your inventory) it’ll cast wandering souls automatically (other skills on right click, don’t)
Yeah, that’s a known bug as well, though it’s to do with the game not realising that your mouse is in the inventory & that the click functionality therefore needs to change (from using whatever skill is on your right click to equiping an item).