For those that don't see the prompt to buy Lion + Lion Server again, there's no need to respond because you aren't having this issue and any obvious input, is just that.. obvious.
For those with this issue, Apple Care won't be able help you because it's a download issue and not an install issue and they suggested to contact the Mac App Store (iTunes Store) support for assistance. Sadly it's e-mail only and probably will take some time. You could try a clean install of SLS to upgrade to LS, but that still might not work. Other than attempting the pain of wasting a day to do a fresh install before the upgrade, I've tried logging out and back in with the Mac Store, created a second admin account and used the same AppleID and both still prompted me to Buy Lion+Lion server again.
For those that haven't clicked on the buy, I still hit an issue that preventing me from downloading the Lion Server after the 4GB Lion image downloaded. You will probably have to request the refund if you attempted this, but guessing you still won't be able to install. Also if you try to upgrade from SLS to just Lion, you will be prompted to buy Lion Server as well. So in the end, it's up to the Mac App Store e-mail to resolve this or perhaps I can attempt to do the clean install.