Why my phone won't set to 1 minute sleep mode?

[Kramkram]

I own an Asus Zenfone 5, when I set it to turn display off after 1 minute inactivity, it keeps back to turn the display off after 30 minutes of inactivity. I tried to fix it using the Battery Doctor App, but it never solve this problem. 30 minutes of display on can eat a lot of my battery. I have to download assistive touch to turn the display off manually. but this was so inconvenient. I just want to turn it off in 1 minute inactivity automatically