I'm seeing this too since the last two days. When i make a post it's always this "Debug mode": SQL error.
That's not very polite! I would rather like to see someting like this: "Hello Louis, thanks for posting on this wonderful forum. Have a nice day"
But since your reply is posted and your postcount is increased, it's more a cosmetical problem,
and please: Don't click "refresh" or your stuff is posted twice! (and in most cases this is not very helpful, he)
same problem is discussed here:
https://www.forumophilia.com/topic85717.html
and here
https://www.forumophilia.com/topic85724.html