yes same problem here. i already wrote an email to opera support, no response.
Uninstall Version 46 and newer (what you get right now from google playstore is v. 48.x) and go back to Version 45!
Where do you get official opera Final apks?
Than scrolling websites while your finger is on the screen is as -smooth- as only kinetic scrolling is right now in opera for android browsers...
... and like it is on the homescreen. 60 fps - i like
alternative try Samsung internet browser.
i think its a problem that is called Enable resampling scroll events
Opera for android, google chrome and Samsung internet browser are using chromium as engine...
Hope they will fix this annoying bug and bring back project butter on our surf-tablets and smartphones.