I dont know how to report a problem, but

I'm afraid you're mistaken about this. You're forgetting that after Black's bishop takes your queen, it defends the g7 sqaure. So exf6? Bxd4 fxg7 is simply met by ...Bxg7.

By the way, I think it's probably better to leave a comment on the page of the problem itself if you've got a question about it. Everything's kept together that way, and it's probably more likely that people who approve the problems will see it that way. At any rate, if it's a problem I've approved myself then I'm sure to see comments left on the problem's page but probably won't see comments elsewhere.

(For anybody curious, here's a link to the problem in question.)

ahh. My mistake. Thanks a lot.
But Im sure there are some positions where there are two correct answers, and an "alternate correct move" could be used.