Monster's health disappearance

Hi

When i fight with a hero or strong monster and see that it has big amount of health (for example 60%) i continue to fight against it and get such situation where all remainder of the monster’s health is disappearing at once,- all 60% of the monster’s health is disappearing immediately (without any time spent) and the monser dies.
Why these 60% of monster’s health disappears?

Thanks

Probably the multiplayer HP display bug where the values aren’t correctly adjusted.
You could try rejoining or rehosting the game and see if that fixes it.