crosschair bug

In the latest snapshot (18w02a) i have a problem with my crosschair (a bug).
i sendet a picture of it in this message.
The right side of the crosschair has a strange shape.

It oneley shows up if i play on fullscreen mode (1920x1080) and my gui sale is on 3.

I realy hope you guys can fix it thath would be dope.
Thanx.