So I'm new around here, and also not particularly experience in using GIMP to make maps, and I keep running into problems with making this world map for an RPG game I'm trying to run. First time it was crashing everytime I try to apply bump maps (that seems to have creeped in again, when it wasn't being a problem on this iteration of the map earlier) Anyways the specific issue I have is that I've got these sets of pixels that have decided they don't want to co-operate with me today. They stay like this regardless of what color I paint them, whether or not I apply filiters to them, and seem to stay like this even if I make new layers which is particularly annoying. Anwyays I'm wondering if any of you know what on earth is going on with this, and how I can fix it. Click image for larger version. 

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