Keth - Lost City - Doors and hitboxes

I'm playing a witch with summoned skeletons.
They problem within these dungeons is,
that enemies and skeletons aswell sometimes struggle to walk through doors.
Once 2 creatures are beneath each other, they just won't walk through the door.

Counts for enemies but even moreso for my skeletons,
which just stand behind that door and don't follow up.

Thanks!