This has happened to me multiple times, I will be hit for much less than my max hp and I will be one shotted from full health, it happened to me recently tonight but has happened quite frequently over the past few days. I have had other people say it has happened to them a few times but it doesn't seem like anyone has ever said anything about it.

Is there some sort of bug with damage calculation that causes you to get one shotted? Or is this a game mechanic thats meant to be in the game