Why is it that using any launcher makes app screen overlap with notification bar?

Hello Guyz I am using Micromax Canvas A120 Colours
Android - 4.2.2

whenever i use any launcher like nova ,apex,go
it works fine first but as soon as i lock and open my screen
all apps like whatsapp,keep ... overlap with my notification bar
removing black dark notification bar
i have upgraded to android 4.4.2 , thinking it may solve the problem
but it still exists
so i again flashstock rom
but this problem is still there
i want to use these launchers , but this overlapping situation makes my phone more worse

please help
Thankyou

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