Line after Downgrade 5.0 to 4.4.4 topic

So guys, i got Android 5.0 Lollipop on my XT1033 so i got camera bug, than i tried to downgrade.

Succesfull, but now, sometimes a line appears on the screen sliding down, i can take it out with locking phone, but, what is this???

And how can i fix it?

And i can Relock boot loader to take the boot loader unlocked screen out?:confused::confused::confused::confused: