Creative Cloud Libraries Disappeared

were they shared files?

First of all, I will move your posts to the "creative cloud services" forum, where you'll have more luck with your question.

First thing that comes to mind would be to ask if you have multiple accounts (ie: one personal and one company) and if the account you are currently logged in with is the right one.
Second one would be to ask if you (or someone else) is the administrator for this account in the case of a team subscription and if all the options are enabled on the administrator dashboard.

If you don't know already, you can check your files online: https://assets.adobe.com/cloud-documents
and check with which account you are logged in there by clicking on your avatar and then click on the "adobe account" option. Also you can also check there if the payments are correcty taken (right debit/credit card etc).