I’m able to see your account now, thank you.
Server-side backups are made much less frequently than local backups on your device. The most recent server-side backup of your account was made on 20 August, so it wouldn’t have captured any changes you made to your collection more recently than that. There is no other way to recover more recent changes that were overwritten.
I don’t know why your collection required a one-way sync, but those messages are very important and should be handled carefully – especially when you have un-synced changes on AnkiWeb.
On a computer, you might be much happier using the full desktop version of the app, which would also help you avoid this situation. Anki - powerful, intelligent flashcards