Actually, it's not an error. The notification tab on Answeree is using some ajax modules and handlers so implementing it on mobile phone views need some coding related to push notifications and all such related. It's a very complex thing but our developers are working on a mobile app. Then there is no point in making such a thing at this point.
Even though you can use that notification tab on mobiles and tabs by switching to desktop view in mobile web browsers.
We will notify on the site once the mobile beta version has passed the initial testing.
Thank you for the feedback made.