Dying In Kill Moves Bug

[Alexandra The Nord Queen]

Hello!

 

Everytime when starts a kill move exactly same time when i'm hit, my char dies instantly! It happens often when fighting for conjurers, for example, cause the magic like Flames cause continuous damage or when i'm fighting with death hounds, that you are hit by a frost damage everytime that you hit they.

 

The problem is that I HAVE NO IDEA what cause this bug, if is any mod or what mod is. Do you have any idea how to solve it?