On my last playthrough of FFIV, after fighting Pink Flans and picking up a Pink Tail :D, I headed back to Mysidia to change to my favoured party, but when I got there, the group that I'd left behind; Kain, Porom, Edward, Yang and Cid where all at lv 99, and Cid, Yang and Kain with 9999hp. The only character who was lv 99 when I left Lunar Subterrain, was Rydia. Is this supposed to happen or is it a glitch?.
I know characters that you meet for the first time, join the party at around the Levels of the rest, and one's that leave during the game, return at higher Levels, but this?
Also I read that Yang's HP will never go above 6000, no matter what lv he's at.

So what do you think has happened.