I used to have a file with all my guys at level 50, but I saved over it because I beat the game.

I think it's normal for them to have 69 of a stat. Fighter starts with 20 STR, Thief starts with 20 AGI, Black Belt starts with 20 VIT, and Black Mage starts with 20 INT. Those stats always increase by 1 each level, and since you gain levels 49 times, those stats will go up 49 times. 20 plus 49 is 69, so there you go. =)