That’s happened to me once and I don’t think it went through. Moderators usually check posts if they contain numerous links so that’s probably what dunnit. John James has a pretty informative post on all things relating to this forum. See “Posts requiring moderation.” This thread may also be helpful.
I’ve gotten similar messages, too. Messages like that can appear when one makes a lot of posts in a relatively short time. That’s why there are those messages where you have to read that hard to read phrase and copy it: the software is checking to make sure you’re not a spam bot.
And that’s all I have to say about that.