Game doesn't save RR/BF/Rampage highest level passed

Hi again. So i recently won a Robo Rumble Insane 6 match, but it seems like the game still doesn’t save the highest level passed (which is Insane VI) Is it a bug or this was kept intentionally?

uhm… hello? is there anyone?

Not a bug. Working as is. Without any saves and etc. The game should select random difficulty level of it. That’s why it doesn’t saving.