Are you receiving an error when you try to edit the second listing?
(Like a blank page, or something like that?)
If so, I had this error also.
I worked around it by using the app to edit my second listing (which worked just fine).
I just could not use the web site to edit the second listing.
It all gets fixed once you publish the listing. (This bug exists only for "created by not yet published" listings.)
Do NOT publish the listing early just to fix this. Edit what you can using the app. Don't publish until you are ready.
(If you are having the same problem...)