I downloaded his textures and successfully followed his tutorial. Then I tried to change it to use a 2 x 2 texture and I get this strange frame where it just clips.
Here is my material, 2 close ups and an image of the strange frame
I am aware that the last 2 frames are the same image.
When I made a 4x4 version, it worked just fine.
I wanted to increase the quality but then when I changed rows/cols to 2x2 I had this problem.