same here with me its change back whenever i change the value...
using steam, same patch
Then I suggest you make a report, and if possible post your save game here.
Please use the update notification system to report a game patch, update or to report that the trainer may not be working with the latest version of the game. If 3 or more reports have been filed, consider BOOSTING the priority of this title for a faster turnaround on the updated trainer.