Uv unwrapping goes insane

Hello , Im trying to texture this scene and I’ve UV unwrapped this air conditioner thingy, so I was going to paint the different pieces white so I can later texture it in another software, but when I paint the unwrapped parts, the paint goes beserk and goes in places where nothing is unwrapped.
here is a photo for proof:


This is the first time Ive come across this problem, how do I fix it?

It looks like you have some overlapping UVs (right bottom)… and also some none selected/ shown ?? This may lead to this pronlem ??

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