Big Kahuna
Or they tell you that you got a Best Answer from 4 months ago.
FemaleLotRfan
It's a glitch.
Anonymous
Oh come on, you've been a member since 2013 and you are only noticing this glitch now? Jeeeez dude!
Son of T3
It is a known glitch. If you keep pressing submit, it will usually switch and tell you that you have already answered.