Front flash of iphone 7 plus is always on

Hi guys ! I would like to ask if everybody got the same problem.

That problem is that when I use my phone to take a selfie the flash is always turns on although I set it to auto. I tried to using front camera for landscape, the sensor worked really fine, but when I tried placing my hand or an object in front of the cam, the flash is always on no matter how much light the you had around you