May have found the reason.
I deleted the Vivaldi folder on the problem desktop and reinstalled it from a backintime backup the Speed dial looked OK. Started sync again. which generated the same mess. repeated the previous step the speed dial looked OK. and reset the remote data, resync. Same mess.
Vivaldi had work on the desktop and my Blackberry for years with few issues. I just installed it on a tablet. I think that is where the issue started. Re-installed Vivaldi on the tablet, deleted and reinstalled the Vivaldi folder on the desktop, reset the remote data, resync.
No Speed Dial mess this morning.
But the day is still young 🙂
Prost: