My brush is pixelated, and it deletes the background around it on the layer. I checked all the basic fixes on the internet.
I used the clone stamp and pencil tool before it went wrong.
Here are some print screens about it. On the second full print screen I used the clone stamp and thats what happened. On the last full print screen the blue lines are visible. It gets worse the more I paint. When I use a layer mask to delete it it goes crazy. Some areas get unpaintable completely in little square shapes. 



I would greatly appreciate some help !
Nóri