Why is my Gamerscore constantly being altered?

Hello ZONTOR,my name is Oskayra, I will be happy to help you in any way possible.

I am very sorry for what you are going through, there may be a problem with the synchronization of your Gamerscore.

You can try to sync your account manually:
In the Xbox app, go to Settings > Account > Sync settings.

Select Sync now.

You can also see the Xbox status and everything is fine, so it could be something else.

https://support.xbox.com/es-MX/xbox-live-status

I hope the information is helpful to you, if not, let me know that I will be happy to continue helping you, good luck and happy day.

Sincerely,
Oskaira.
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why are we paying for a service that constantly has issues? i put alot of time effort and energy into my gamerscore, just to have it thrown away by a dodgy server...its a joke

Gamerscore is intended to be an accurate record of your career as a gamer. Allowing people to alter their Gamerscore undermines the entire system. You can choose to hide it, and delete games with 0 Gamerscore. That's pretty much the limit of your ability
to customize.

I'm playing Fable 3 on Xbox One, I've just unlocked a few achievements but my Gamerscore hasn't altered yet.

Is this a usual issue when playing 360 games on the One?

It'd be a lot more helpful if you altered your privacy settings so we can see you Gamerscore on here.