invalid thread

I just tried to post a poll and after I posted the thread and went back to the main page it came up as an invalid thread here is what I did

I chose what I wanted to type changed the poll amt to 3, hit enter, it brought me to a new screen asking for the poll info. Which I then proceeded to enter, I then decided I wanted to change something so I hit the back button, then went to hit submit thread and it is now an invalid thread. I got an extra post for it and now you cant reach it. Thought someone would LIke to know

And on a side note to that, Moderators cannot delete invalid threads. =P

to let you know, I've seen that a lot lately here. You will see a link on the main site but click on it and get that "invalid thread" error