You can try the following suggestions,
proceed to clear the cache and then Restart your Opera again.
or you can reset back to default settings, if that doesn't work
try uninstalling and reinstalling Opera again.
Hope that works for you.
Do more on the web, with a fast and secure browser!
Download Opera browser with:
@patrick98 Go to settings > website settings > notifications. There should be a list of all the websites that have notifications enabled
Also, log in to your facebook account, go to account settings > notifications > mobile. Turn on the notifications
If however, all notifications are turned on, yet no facebook notifications on opera browser. Turn all notification off, log out then force close the browser. Open the browser and log in to Facebook again, you should be asked if you want to receive notification on this browser then click yes
For a high-end phone, of course, the best one to go for will be Opera browser, opera mini goes for you know low RAM, low memory kind of phone and also If you intend to save data. Personally, I use Opera Browser for web pages that I have to do registration kind of stuff or web pages that won't open on mini properly. Mini goes for surfing through my facebook page, I have gotten used to using mini for that. I have not dabbled with betas before so I can't talk about them.
Have you tried clearing the browser cache, doing so make the browser faster and can also fix the VPN issue. Press Ctrl + Shift + Del hotkey to open the clear browsing data window tick all the boxes especially the Cached images box and files option. Try to choose the option “the beginning of time” from the drop-down menu in the options.