i haven’t played halo in awhile and decided to look and see how many games i played in halo 3, site says i never played it even though i played at least around 2,000 matches. Same with odst and reach, did they wipe old game stats from the website?
Have you changed your gamertag at any point between now and when you last played? If so, you just need to load the games back up again for them to sync your data.