Cat-Writer your two messages are worded slightly different.
If the system was responsible for the "double posts",they would be worded exactly the same.
What I think is that you tried to post the first one and it went but maybe it took to long so you typed out another.
I'm not nit-picking at you or picking on you,just pointing out that "exact" double posts are usually from hitting "add reply" to many times.
Overall though,no biggie apologies aren't necessary.