Sometimes when clearly hovering on a mob and left clicking, I just do circles around the mob instead of attacking with Mana Strike (not a mana issue). Other times after click an object (e.g. a shrine), clicking to move and holding it down then causes me to move where I clicked but then a second later move back towards the object I had clicked and back and forth. Very janky.
EDIT: This is with “Move to melee attack” option enabled.