What the little silver skull in the top right corner in BGs stands for?

https://i.imgur.com/2QfshEj.jpeg

What this thing in the top right corner means?
The skull with 0 in silver color.
I thought it counts your kills or deaths but as you can see on the scoreboard, I killed 2 and I died 2 times but the skull is still 0.

What that skull stands for?

Normally, if you mouse over the skull, it will say something.

But honestly, as I don’t really PvP, I can’t tell you.

It says nothing!
Thats why I ask what is this.
Maybe a buggy thing?

Maybe it could be related to unranked/rated or something?

Dunno. I`ll check it out next week when the rated BGs are on.
I also dont have any addons. Its from the game.
Dont remember if the skull was there before TWW.

But it never change. It stays 0. Maybe a bugged Blizz feature or something.

Looks like a visual bug of an asset that shouldn’t be there. In dungeons/raids it denotes the difficulty and scaling to number of players.