Multiplayer points get lost??

Hi friends!
There is something i will ask you, that i not understand.

Yesterday on sunday i played TMUF until i arrived 80000 points. After this i couldn´t get any more points, ok.

Today i started the game, my points were fall down to 77500 points. Also in maniazones list my points are at 77500.

So what is happened? Where are the points gone? I was a bit frustrated, because i spend nearly whole weekend to arrive the 80K.

Is it an bug, or has someone noticed the same problem?

So, i see one week later the same happened again.

I asked someone in the game. It is normaly, and happened every monday with every tmuf member. Its the points/rankingsystem from nadeo.