dunno how it got posted twice; sorry
Maybe, if it appeared not to have been posted on the first attempt, i.e. you did everything to post it correctly, but it apparently failed to post correctly. Then you posted it a second time, under the impression that the first attempt was a mysterious electronic goof-up that apparently failed to post, but it actually did generate the posted comment.
I hope I didn't lose you. But I'm pretty sure it has happened to me. So now when it appears that my post was in vain, and I'm tempted to repeat everything to post again, I open a new window on the forum and check my latest comments. More often than not, I find that it posted correctly. Somehow, an electronic goof-up occured, looking I, the hardware or the software goofed, but I actually made the intended comment.