Bummer mate! I feel for you.... if it makes you feel a bit better listen to this... I just had another encounter myself with GTSport's funny little ways: So after uncountable tries I just knocked almost 8 tenth off my lap time, fist pumped as I crossed the line, crashed because of that (of course)... now thanks to this combo in particular I find the options button on my wheel as fast as Lucky Luke, so while the AMG is still flying out of turn 1 into the gravel I hit that exact button. Went ahead to save the replay etc. etc...
You can probably figure the rest already.... Anyhow now my replay thumbnail states my new best time correctly , but when I play the replay it cuts off just before the finish line. Now I'm shure the moderators would give me a break on that as is would be physically absolutely impossible to still put the car off the track on those last 10 meters.... BUT: the replay live timing final time is stipulated besaid 8 tenth longer than what the time actually is, so when in comes to submission/verification I would be stuffed (I think we had a long discussion on that here earlier) ... sigh....
Bottom line (or summary for those who don't have time for all my blathering about above):
> after a good lap make sure you run the car out for a good few hundred meters before exiting!!!
(this had been pointed out somewhere before, I know, but repeating it may just save somebody else my pain I thought.....)