I've written four threads for stories I'm not the owner of, none of which are approved yet. I went to see if I could edit one of those today only to find that the one I was looking for was missing. There was no notification that it was decline, and I have my settings set to do that. Previously I had received notifications so I assume that works.
I have looked at it and it seems as if your threads aren't approved yet. To make editing and viewing easier, I have changed the code. Pending threads are now listed for logged in users as follow-up questions (story map excluded). But you can still access your pending threads under "Manage stories" (triangle next to your username at the top right).