The Overlay Synchronization / Video setting had been left at the default 1s. I have not changed any of those advanced settings. I have gone through and deleted a lot of my old Harry's video that I no longer needed, and done some database maintenance (there were several hundred errors found and fixed...

During my last few track track events, I've noticed the overlay data getting further and further out of sync with the video captured using my iPhone 7 and Harry's LapTime GrandPrix Edition v21.0.7 (and the prior version, since it updated recently). At first the data overlay was only a second or two ...