AK flop A or K

[spatch]

What are the true probabilities against on average of 4 opponents when you have AK and flop an A or K. I play online, and have @ 3500 hands loaded into my poker tracker. When trying to figure out why I've lost $ on AK, I found that of the 12 times I flopped an A or K w/ AK, I won 7. 59% win when I hit the flop we're looking for. Am I just on a bad run, or should I expect this?