Damaged PEI Smooth build plate?

Anyone else notice on their build plates in the location in the center where it homes the buildplate during the startup of every print. I noticed when cleaning my plate, at first I thought it was debris but after taking a closer look it looks like its got a nice indentation in the plate surface. Is this normal? Is this a concern? Is anyone else experiencing this? I was thinking this might effect bed levelling

Totally normal, they all look this way eventually.

Yup, normal. I consider the smooth plates as consumables anyways.

Would this affect the z height when it does its auto levelling?

Not really. 25 characters blahblahblah!