It's the tris. They are offset for the rest of the wall segment by the winding order, I believe.

The only fix I've ever found for it is to redo the geometry itself in that area -- remove the tris.

 

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)