I'm getting strange lines around my sprites. They seem to be at the same place as the collision mask. It's not visible when I open the image editor. I can fix this temporary by going in there and make some pixel adjustment but the next time I open the project it appears again.
The picture is rather small so might be hard to see but I'm talking about the little red line under the arrow and on the right side. This is happening on multiple sprites that are used as buttons.