The hotbar needs some sort of organization. Every time I pick something up a new icon gets added to the hotbar. Every time I change my spells they get moved around on the hotbar. I just spent like 15 minutes cleaning up the hotbars for my party and after 30 minutes of play they're already back to an absolute mess.
The fix is simple: spells and abilities should just be locked on a bar and visible at all times. Items shouldn't be added to the bar unless I put them there.
Open game preferences, there is a option for that.