Mana drain ring on rare mobs is sometimes offset behind them

On some rare monsters, the mana drain ring is offset relative to the monster. This seems to happen on specific monster types, maybe due to their models being more leaned forward. I've encountered it on the one in the image above, as well as on some boars (the big ones that charge and have high attack speed).

So far the offset was always causing the ring to be behind the monsters, causing melee fights to drain your mana since the monsters will be looking in your direction when attacking. Being a mana-based build, this has been a rather annoying issue for me, especially with fast moving monsters.

You can clearly see the offset when you make the monster rotate in place : the ring sweeps a large area behind him.