You need to remember, it does that every time you post a new topic. That way, next time you will know not to refresh. Always check the forum before attempting to repost your topic as well.
We have all figured this one out by making the same mistake. It's just one of those things that breaks you into the GCU forum.
I myself wish they would fix it, but they claim they can't.

Oh well!
P.S. Your store is kind of spooky. I like it, it's different.