It looks like this demo rod has a a handle which is not in the right plane whilst the shaft has perfectly aligned "natural bending position" pieces, which leads to lateral deviation. This is why it is better trying to make the rod "bending neutral" by shifting "spine axis" in between rod pieces.One model from a top brand that I will not name, shocked me when I kept missing the hoop to the right. Of course, I first thought it must be me, but up until that point I was not at all embarrassed with my accuracy casting, even in public. Just to be sure I immediately tested another model and the fly once again went straight to the hoop. I find it interesting that an expensive model of a top brand would have a glaring error on a specifically chosen demo rod. So… it must have been me.
Merlin