I'm not really sure what happened here. Usually when the URL matches the submission simply upvotes the previous story, in this case that didn't happen for some reason. As a clarification, I never saw the previous submission.
Also, the other URL has additional parameters - RSS feed, something else - so the URLs don't match exactly.
The other attracted no comments, maybe this one is better timed. It's one thing I wish could be fixed on HN. It's one thing for submissions to be ignored, but having them not seen at all seems a bit of a waste.