Bottom of Grass vs Dirt.

Has anybody else noticed it's different? It's bothering me now.

Edit: Now noticed it's the different for the sides too. Had looked in the dark before.

Edit 2: Apparently caused by BetterLight. Why would it do this, and is there a way to fix it? I haven't seen anything to fix it in the post for BetterLight on the forums, but I may have missed it. This goes for all texture packs.