@sadsweat If you chose to encrypt all your data, that's how it will appear in www.sync.opera.com because the site doesn't now how to decrypt it nor has the info for that.
same for me
just lost all my passwords somehow
i restarted opera gx and i was signed out my account.
then i couldnt remember the Password.
so i reset it
and now i have lost 400 passwords.
to a game i liked playing.
It has happened to me too, it is a pinned tab, if you set a web page there and then you close opera, when you open it its still there. For removing it you need to right click it and click "unpin tab"
(Sorry if my english isn't good it isnt my first language)
@burnout426 I dont know what sites use high ram. I dont use operas ad blocker but I use an external one. I usually only have 3 tabs open at a time though.