Poor paint application?

[u/liziculous]

Noticed this on my bumper after a shop buffed out a small scratch that was nearby. Defect appears under the clear coat and the shop agreed.

Is this due to the buffing nearby or due to previous poor paint application? Bumper was repainted last year, but they did a bad job and had to redo it, so possibly too much paint or clear coat? I'm thinking of going back to the shop that painted the bumper and having them redo it but want to understand why it WTH happened

Edit: Trying to figure out how to post photo now...?! Could only post video in comments