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I'm no expert but here's some ideas and things that happened to me.
Plug wasn't fully dried from sealer and bubbled paint.
Too many coats of paint. I do the minimum amount when I can.
I know with spray paints if they dry too long in between coats you'll get that problem.
Could have gotten Oil or a greasy substance on it, even touching a plug can do that.
Humidity can also be a factor.
I know that doesn't narrow it down but these are some reasons it could of happened.
Posted from my iPhone/Mobile device
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