I know many of the zenfone user are facing this issues.
For all the apps like sms, facebook, call, whatsapp, imo, hike, wechat etc. While chatting when new message arrives and you read it on chatting and close the apps the apps still shows 1 unread messages, for this I have to reopen that particular app again and again to clear the badge notification. It's happening because of the updates of the ZenUI Launcher and I'm telling you the version of the ZenUi Launcher v2.2.1.8_160331-1520201042. The issue had occurred after the update of the following. Till this version there was no such issues and it's been long time we are facing this issues.Please provide me the exact solution of the issues.