Losing beat grid with using mobile sync

I am using Rekordbox 6.7.5 on an i9 MacBook Pro running Ventura 135, and 4.0.3 on an iPad running iOS 16.6
I have  DDJ-FLX4, but this does not affect this issue as it is not connected.

I download music from Tidal on the laptop and put it a Playlist. I then mobile sync this over to the iPad. Take the iPad to Starbuck and do some work on the beat grid and place some markers.
I then bring the iPad back home and sync it back to the laptop.

When I do, the beat grid and markers are shifted. It's a small amount, like an 1/8th of a beat, but it still throws off the grid enough I have to re-fix it on the laptop in order to use the music in a mix.

If I then re-sync it back to the iPad, it is then shifted on the iPad in the opposite direction by the same 1/8th beat. I have also sync'd with a different iPad and my iPhone and they all align with each other, but not with the laptop

I've tried turning off auto-analysis and locking the grid before I sync and neither seems to be helping.

This is very annoying and basically renders mobile sync useless for doing remote beat grid work.

Any idea what I'm doing wrong?