Every Demigod does this with almost every ability to some extent, but it seems to be much worse on certain Demigods. I only get it occasionally as Oak with Penitence sometimes not activating at all, but with UB well over 50% of Foul Grasp clicks result in him standing on the spot or stopping chasing the target and not using the skill.
Couple that with the awful path finding getting me stuck on invisible walls, running on the spot or spinning in circles on corners and it's surpising anyone ever kills anything.