Originally Posted by Pepsi

I'm guessing your left fork leg has a 'turn' in it. so the disc runs close to the edge of your calliper either where the disc enters the calliper or where it leaves, or probably both but at opposite sides of the calliper's disc groove.

In other words the disc is not running perfectly parallel to the sides of the calliper due to a twist in the fork leg.

As mentioned; the best way to solve this is to raise the front wheel off the ground having undone the two pinch bolts that clamp the axle and also having backed off a couple of turns the axle's torque to make it loose-ish

Squeeze and release the front brake lever a few times and then keep it on ( Zip ties) whilst you re-tighten the axle nut and then pinch bolts. Whilst the wheel is off the ground give it a spin to make sure it runs clearly. The fork legs should have turned to face the correct alignment due to the callipers being applied to the wheels' discs.

Hope this works for you.