Lemme see.... 13 suited cards... 3 people w/ 2 is 6... 4 on the board with the flop and the turn... so 10 out of 13 from a 52 card deck...

x = 3 * 2 + 4 - (y * 2) where y is the number of players at the table / z% probability of ruckus.........

awww hell.... dude, sounds like you just had a bad beat. I can't do this math but I can tell u I have run up against flush over flush at least a dozen times in the past 10K hands I've played. So arbitrarily determining whether the odds exist for three to have flushes, I'd say small but obviously possible...

Heck... what are the odds for a Royal Flush... but they happen. Of course in 52,000 online hands I haven't seen one yet, but my chart o' poker hand rankings tell me they're possible!

It sucks, but you'll make it back over the long haul...