When you post a question, DON'T hit Submit several times, and you shouldn't have to worry about multiple posts. Before you hit submit, copy the text of your post, then hit Submit, wait a few seconds, and refresh your screen. The question should be there (that's how it's working for me when I post answers - Submit, the refresh and the answer is posted properly).
It's a glitch. It's been posted about by others several times, and we don't know when or if it will be fixed, and of course (as with all other issues here) complaining doesn't change anything.
Where YA is concerned, these days, we need to adapt or leave, because it's clear the powers that be aren't really concerned about our opinions or issues on this site.