Notifications Issue

[gujuguy003]

recently from sunday my pop up notification from whatsapp are not showingup on lock screen. I now have to press home button to see that pop up notification on lock screen. previously when phone was in lockscreen and if i got whatsapp message it used to pop up on screen without pressing anything and i could just do whatever i want from there but now its pop up on lock screen but i cant see it until i press home button after it vibrates or make a sound. I have a note 3 a friend has galaxy 3 or 4 and it works on that.

so i factory reset my phone last night and nothing doing. Even there is no update on whatsapp that could have done this. any help will be appreciated.