Incorrect gamerscore displayed

Hello,

I've had a goal lately to get to 100,000 gamerscore and I was able to achieve that today, and got to 100,000 exactly this morning. I thought that that was my gamerscore. Well, I went on Trueachievements.com and looked at what that says my total gamerscore
is. It said it was 100,510 at the bottom of their games page in the gamerscore column, so this tipped me off.

So I copied that data, put it into a spreadsheet, and manually checked the gamerscore for each individual game on both my xbox 360 and xbox one. The gamerscore for each and every game thats listed on my xbox one and xbox 360 matches what Trueachievements
says they all should be...383 games total. Manually added those gamerscores for each game, with those numbers taken from my xbox one and xbox 360 dashboards, and it does indeed total 100,510. But the displayed total on both consoles is 100,000.

Also, on the Xbox 360, when looking at the achievement list, the "Xbox One games" says I have 34,103 GS on Xbox One alone. On Xbox 360, under "Social" and looking at the achievement stats, it says my total Xbox 360 gamerscore is 65,897. Adding the 34,103
and 65,897 comes to 100,000

But again, when adding the games on the Xbox One (and some windows phone and 360 games that only show up on the 360) the total is 100,510. I added this and triple checked each individual games; total, and it always came to 100,510. So basically, I have earned
more achievements/gamerscore than the total that is actually displayed. I have no idea what achievements have not been counted. Please help!

(Here is my Trueachievements link. Click "show all" and scroll to the bottom of the page and look at the Gamerscore column. It says I have a total of 100,510. https://www.trueachievements.com/gamer//games)

:)