It's been happening lately to LOTS of people. If I am told that the post had an error while attempting to post, I just open another tab and look at my blog to see if it actually posted or not after a couple of minutes.
It still happens and yes, I did it 4 or 5 times before figuring out my mistake. Oh well!!!
Well I'm happy that I'm not alone in the multiple posting mistake(I did 7 multiple posts...blushing like a school boy on his first date) lol. Thank you for your input on the topic.
P.S. Some of the folks also don't like it when you upvote your own posts and comments. FYI. I am not sure how I feel about it myself since sometimes I am one of the few upvoting my essays.