[Marketplace listing showing when looking at Marketplace through the website, but getting an error when trying to make the listing active]

My marketplace store shows 4 listings of items that I know I did own at one time and should still be in my inventory to sell.  If I look at the Marketplace store and view my listings through the website, they appear there as unlisted.  They do not appear in my Marketplace Listings window in world.  I get an error when trying to list them through the Marketplace website.  I have tried testing delivery and nothing happens.  The item isn't sent back to me.  When I refresh my screen it doesn't disappear from my unlisted items online.  Help?