Notifications

There is a bug in whatsapp notifications configured in settings menu. I keep custom notifications for few contacts in whatsapp. So when i go to app info >notifications Under show notifications you see the person name too to enable notifications. So i disable message notifications except the person notifications. But when i do this i get notified even for every whatsapp message from other people. I tried going back & to app info &, opened again notifications, The message notifications option got enanled automatically.. Hope you understood the issue..   Any idea how to fix.?