Landscape tile darkening on seam

I’m having this problem where there are these weird darkened seams that run along parts of my landscape texturing, but they they don’t seem to be discrete lines or anything. Rebuilding lighting doesn’t seem to address this issue.

landscape_dark_seams.jpg

Ugh, so apparently, I tried two different grass textures from a certain publisher and they both had this effect. I tried yet **another **grass texture, and that one didn’t have this problem! It seems like this publisher just seems to have two grass textures that exhibit this problem, and it was just coincidence that those were the first two that I had tried :frowning: