That is a known problem; monsters hanging in mid death animation. One person was able to sleep to force them to finish dying, another could wait 30 seconds, but for most people they just get stuck.
Lews is right, the easiest fix is to upgrade to the Sword of the Gods, in one of the houses east and south of the mostly-deserted village.
I don't recall if the item editor mentioned in
please help with my blind hero can modify skills, but if not you could always PM DAD (
Item editing teaser) about how to remove either Frost or Stun, or change one to something else.