Randomly dying to undead respawning

Using a lifesteal weapon (imp talons in this case) and striking the killing blow with the life-steal component seems to have some strange interaction whereby it kills the attacker.
Didn't screenshot combat log but pasted it:

"Zewpeme lands a critical strike! Zewpeme hits Crypt Keeper for 74HP! Crypt Keeper loses 74HP! Crypt Keeper dies. Crypt Keeper is resurrected! Zewpeme gains -4198HP. Zewpeme dies. Crypt Keeper gains 46 poison (599 total)."

Shyla hits Damned One for 46HP! Damned One loses 46HP! Damned One dies. Damned One is resurrected! Shyla gains -216HP. Shyla dies.

[Album] imgur.com

This happend @ 7:40 AM 6/10/2018. Win10.

This too has happened to me. It seems to occur right on the final blow when it is a critical.