Android Moto G4 Plus - black horizontal line swipes down on unlocking through fingerprint

After the latest Nougat update on my Moto G4 Plus(which I bought 2 months ago), i am seeing a peculiar issue where a black horizontal line swoops from the top to bottom.

Steps:
1. Unlock screen. Lock screen appears.
2. Open the phone with your finger print.

As soon as the lock screen goes away, there is a thick black line which moves from top to bottom on the screen. Before it was a thin line when the problem first appeared. But over the past 10 days, it only has got thicker.

Anyone else got this problem? Any leads why this could be happening?
 
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