Not sure if it's a bug or just attack rating things (but most my weapons got the 90< attack rating with pink gems). But this really bugs me a lot. Not sure how to describe it, but I try my best!
Whenever I use ZEAL when surrounded (2-handed weapons), after I kill a monster, with 1st or 2nd hit (5 hits max), my next other hits won't even touch the other monsters, and this happens A LOT. I gotta switch position a bit to hit the next monster. Even worse, my ZEAL sometimes replaced with regular attack (and my mana was still full that time)