Ive heard of this issue before.
I think it happens when you make a map and then login as the same person, but using different caps.
Ex: Made the map while logged in as "PixelByte"
Logged out and logged in some time later as "pixelbyte"
Now when i save the map and try it, it will say "Map Not published" because it only works for the Owner.
What im saying is the site thinks your not the owner because the other is "PixelByte" and Im "pixelbyte"
Try logging in with the caps used in the map.
http://prntscr.com/8z5a1ssince i made the map as "pixelbyte" I have to login as "pixelbyte" instead of "PixelByte"
maybe it wont work, so you will have download the map, delete it, and make the map again, and restore the source with the one u downloaded.
If that doesnt work, then im not aware of the problem.