“This discussion is closed”

I got this message just now at the end of my thread  I don’t know why. Not a controversial topic in the least


IT was closed because for some reason two of the same posts were created.   

I posted a discussion few minutes ago and it doubled, I think there's a bug and admin should look into it.

BTW, I can delete one of the same discussion by go into the page "Discussions I has started".