At least one post has been made...

[brassmedic]

I'm getting this false message that leads me to believe I need to resubmit my post, but then it double posts.

[BGuttman]

I got that message once -- and the post was mine!

[brassmedic]

Normally, it seems like it's a warning to read the new post in case it makes your new post redundant. But sometimes it seems to have already posted yours before giving you the warning.