Upgrade StorageSomebody else's library on my Zotero account
When I go on my Zotero account, my library contains a number of files and documents that don't belong to me (and which are not in my group library, but in my private library). I've no idea where they come from, and I'm worried that somebody is able to use my email address and password to access my account.
https://www.zotero.org/settings/security
(This could also happen if you're using Zotero on some sort of multi-user system, where another instance of the Zotero Connector on the same machine is saving directly to your local library.)