Annoying unknown texture on screen

I have been playing Minecraft for a few years now, however, there is annoying bug that renders an unknown texture appears on my screen. I can’t get rid of it, and I have no packs. It is annoying, as I have not as good as a view as I used to in the game.

 

NOTE : I HAVE FOUND A WAY TO FIX THIS. I DO NOT NEED HELP ANYMORE, ALTHOUGH IT WOULD BE NICE TO FIX THIS.

 

However, I have wondered if the Minecraft cape, the Bug Tracker cape, is it still available? If so my username is @shunoni.