Don't you just love this stuff!?!
I think the Sony store software and its integration with ADE is a mess...my computer is no longer authorized with them but I can still buy/download/transfer books. Oh well, it works. Your problem sounds like the Sony store is confused about your AdobeID accounts also and so some of your stuff is authorized and some not..who knows. If you start deactivating and reactivating things you're gonna have the same problem I had which is the dreaded 'too many activations' error. If you truly don't care about the few books you have already downloaded and you don't want to wait on the phone forever with tech support, you could always create a new AdobeID account and start from scratch with 6 new activations. I would create a new Sony store account too....can't remember for sure but I believe I used the same email info for the store account as the AdobeID. The problem trying to debug this problem is that by the time you sort it out you will probably have used your allowed activations and then you have to have tech support straighten it out.