A glitch in trophy milestones?

[Jay]

So, I was aware that I was approaching my 4000th trophy so I intended to have the milestone be something kinda cool. I earned my 3,999th trophy, "To The Expo", and my 4000th trophy was "Mighty Heroes" from FIFA Street. I updated my profile, my 4000th trophy milestone was "Mighty Heroes" as intended. I checked again today, it has changed to "To The Expo" which was my 3,999th trophy. Any idea how this might have happened so I can avoid it happening in the future?

[thegirlruka]

Is it possible that you had an unsynced trophy on one of your systems?

[Maxximum]

Maybe there is just one trophy you didn't sync, that's how it all got messed up. There was also a similar thread like this, and it was solved with this answer 

[Jay]

100% not the case. I always sync my trophies on both consoles. I made sure "Mighty Heroes" was my 4,000th platinum.

[ghostehkins]

Did you hide a game with one trophy earned? Same exact thing happened to me, and it changed a milestone of mine.

[Matto_lsi]

On another note, you may be able to track down which trophy it was that threw you off by looking at your other milestones.  If all other milestones through 3500 trophies are the same, then it's obviously a more recent trophy that screwed things up.  Additionally, it's possible that you just miscounted.  I did that when I earned my 1000th trophy.  I had it all setup for the ME2 plat, but instead it ended up being the last ME trophy I earned before plat as I miscounted my walking dead trophies.