What have your experiences about this been? Is match fixing considered a common occurrence in leagues you place bets at?
Since you have mentioned, a league that we place our bets, do you mean a league that was listed in most bookies?
I'm pretty sure all of my followed leagues that was covered by most bookies are fair and square. Maybe there might be some concerned calls and issues on some particular games or match but not to the point it will be considered as game fixing in general.
By the way, if that thing was in your mind, do you mind sharing your followed leagues that you think always have a controversy?