I thought TUF fights were always exhibitions...

I thought the rule was and always had been that fights on TUF were exhibition fights, and didn't count towards professional records.

Why do all these guys weighing in have 1 loss, except the four guys in the finale? 

I confuse. 

TUF live were sanctioned fights that counted. Not sure the current season since I haven't watched it in a while but other than that I believe they all were exhibitions