Ugggg....sorry, apparently I didn't set it to notify me on replies. Yes it was with a save from an older version, from before the option to disable exp scaling existed.
But I did figure out how to replicate it, if I talk to the reset NPC (standing infront of him in the save) and try to rebirth and get the "not high enough level" message, then try to change party it will set everyone to 99.
https://drive.google.com/file/d/1ch0qz1PDtOcoQOvtSY4Z4Mp1NNNanGIs/view?usp=drive...