Hi there! Maybe I missed something in the beta patches, but I'm also experiencing similar issues with TGP alignment.
MT
Before takeoff, I input coordinates in the DED, and coordinates in the DED and on the TGP page match. However, right after takeoff, coordinates displayed on the TGP change. During the flight, I periodically press "TMS.aft" to perform CZ and almost every time coordinate point shifts. Then, I proceed with landing, press "TMS.aft" again, and coordinates sync up with the DED once more. I've attached track for reference.
I also want to note that when I press "TMS.aft" during an active pause, coordinates always match. But as soon as the flight is resumed, the shifting issue appears.
f16_TGP_TMSaft_shift.trk