Problem freezing a player's value

Hello I recently bought a license for fmrt17, I have it already activated but it gives me a problem when I modify the value of a player.

At first it is done, I freeze it and everything is ok, but after 3 or 4 days in the game's calendar the price is low again and what I put doesn't stay.

I don't know how to solve this, thanks to see if they can help me or if I do something wrong.

Greetings