Your symptoms sounded similar to ones I thought we'd discussed at TS, although I can't find them. The point is, since you have your Safari mobile and Desktop apps somehow synced, next time it may be better to access the app from the Desktop side first.
Probably best to un-sync first. Fix the problem, if possible, on the Desktop app, then re-sync. Hopefully, the latest data over-writes the previous versions of whatever is synced.
The earlier reports were concerned with the browser 'locking' the user into an endless loop requiring either the payment of a ransom or downloading more software of obvious danger. The fix was rather simple; deleting files in the /Library and ~/Library. Those kinds of actions are virtually impossible on an iDevice.
BTW, how does one "sync" mobile and Desktop
apps?! I assume via iCloud?