http://www.mmarmy.com/showfight.php?fight=263710

http://www.mmarmy.com/showfight.php?fight=159491

http://www.mmarmy.com/showfight.php?fight=583154

http://www.mmarmy.com/showfight.php?fight=95762

http://www.mmarmy.com/showfight.php?fight=750048

Pretty much all examples of fights where the the superior style with similar stats lost for whatever reason, and that's the ones I could think of off the top of my head, without the far more common GnP being owned by PG etc. With a more fine tooth comb I can certainly find many more... and even more where the superior style lost because the fighter didn't have the stats to support it. It's how the game works. Because I can go through my records and find examples of the "better" style losing because of lack of stats to it winning despite that lack at at least a 10-1 proportion.

And why did it happen? Because the internal mechanisms of the game gave you a bad result and him a great one. Perhaps it gave you a great result earlier when you fought 270lbs fighters. I can give you examples of LW's beating HW's... and then I can give you this

http://mmarmy.com/fighter_display_record.php?id=85317

Much like real life MMA, there is an element of chance involved in MMArmy. It gets a disproportionate amount of press because no-one talks about the time their 2.75* PL'er beats a 1* FF fighter... but the one time in a dozen the FF fighter wins merry hell is raised.