A.I. Photo Restoration Artifact

On any lower contrast, lower detail image that I use the A.I. Photo Restoration on, I'm getting this "t" shaped artifact in the image. It segments the image into 4 boxes. Sorry for the boring out of focus picture but it's what I had available quickly to show this. It happens on any picture with a lot of blank space. This filter is super useful for improving our scans of tiny format film like Disc Film and 110 but I often have to leave it off or layer it in at a low percentage because of this.

What's up with this and how do I get rid of it?