Stats reverting

So i'm facing an issue with FMRTE, where sometimes after changing a players stats, they'll revert/downgrade in a few days. 

Here's an example: I've changed Nkunku's stats so that the recommended potential is 165, and his current/potential ability is at 165/167. A few days later, his stats will all drop and his recommended potential is now shown as 149. 

Now this is weird since it doesn't happen all the time, in the vast majority of edits i make the stats stay, or are only changed a bit. Where as in the example i made it's a full -1 for all his stats. 

The stats never goes up in instances like this, it's always a full -1 to all stats across the board, which i don't understand when the current/potential ability should be enough to cover that.