A screenshot of Preferences > Sync from this computer would be useful.
Is it possible that macOS is miscalculating file size? This is a documented bug in Safari. It did happen to me in Safari.
That’s at least possible.
Trying this out now. Thanks.
But why did the iCloud usage stay under 6 GB since the beginning of time up until now?
A thousand thanks. That was indeed the problem! Incredible!
My apologies to everyone for having overlooked this.
Many thanks to all who took the time to help.
Glad to hear it’s worked out!
Have a great weekend!