I can't answer why you do it but me, once in ablue moon I hit send, I don't think it went through and hit it again so I have to go back and delete the double post. I think that's what I do, hope you figure out with you and if you do let me know, maybe I am not doing it that way.
It might be something to do with slower response on dial-up. Also sometimes it takes so long for the screen to come back even on DSL it's tempting to hit the button again. If I open another screen my post will be there long before my screen with the post says it is.
Cause you're like me, dude! You click "post," nothing happens, you click "post" again, again nothing, you click "post" "post" "post" "post" "post" "post" "post"...
Cause you're like me, dude! You click "post," nothing happens, you click "post" again, again nothing, you click "post" "post" "post" "post" "post" "post" "post"...