Same thing happened on one of my previous versions. Long story short, there was a screw stuck in the hairspring that bent it. Had to have it serviced. Worst part? It happened after wearing it 3-4 times and within 10 days of getting it in.
This can happen to pretty much any mechanical watch including some of the rep movements.
Many people had similar problem with Noob Panerai Pam111. It’s well documented on RWI. Sometimes you could literally spot loosen screw when looking at the QC pics of caseback exposed movement.
id say it’s pretty rare to have that problem with JF 15400 miyota movements. It was somewhat common with noob Pam 111.