Using Flat Paint on Flat Paint that had been touched up with Gloss!
Take some ordinary yellow masking tape and put it over one of those "blotches". Press the tape down, and then pull it off quickly. If the top coat of paint comes off with the tape, then you need to do something to improve adhesion.
Maybe just take a paper towel and wet it with acetone and dissolve all the paint in the area of each blotch. Then just reprime and repaint those areas.
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