Flush's common as dirt...
On UB the semi-standard hand is a flush. I have no idea why that is and I will say that it is more common there than anywhere else in my entire life's experience HOWEVER, that being said, whether it is random chance or a flaw in software it doesn't really matter. Poker is a game of statistical probability and there are ebbs and flows in trends that occur no matter where you play or how the hand is dealt. The trick is to recognize the trends and adapt your style of play to the conditions in which you find yourself.
I play 7 stud almost exclusively and no matter how good a player you are there is no accounting for random chance. At low stakes tables it is a virtual certainty that at least one player with a flush draw will stick through the river even if you're showing 2 pair on the table. I have no idea why this is but it's something that I've seen habitually in my online play. The only way to cope with it is to play your hand, read the odds
and the tells
as best you can, and if you don't boat up - check to the better and ride the wave odds are they'll come up short and you will take the hand.