Hard lines in tree texture

[MrPug]

Hi, I was doing the Texturing The Bark lesson from Rock & Trees section of ’ Blender Environment Artist: Create 3D Game Worlds’ course.

My question is why there are some hard lines in the tree’s texture? The shading is smooth and I did tweak blend options as well. Is it normal/avoidable and any way to fix it? Thank you!

[NP5]

I think the lines you refer to are seams. Play with the blend factor.