It's not normal!
There is too big difference between normal game and friendlies.
Both played in the very same date (in less of 8 hours) with same players, formations, tactics, etc.
But results are 0:1 and 6:0 ?! In real life that's impossible! So it should be the same in OSM too.
So I strongly suggest that your programmers do a much better job about similiar thing in future.
p.s. By the way, just to mention, I don't have any idea how I played the first of these two games (Cup final) without more then half of my best players?! Check this bug, too.