PNG autocoloring when "opening as layer" over something

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I'm not even sure how to put it, but i seem to have an issue where if i open a png "as layer" over an existing image, specifically flags, the opened layer gets colored in the colors of the base layer, i have no idea what causes this, but i tried resetting preferences to default, and even deleting and reinstalling GIMP, but nothing seems to change. If anyone could explain what this is to me that would be greatly appreciated.