Can a leather wrap cause a cue to appear warped or have a small rollout at the joint? Has anyone had experience with this?
If the wrap is put on badly enough, sure. Is it sticking out a ton or is it flush with the rest of the butt? If it is flush, you're not going to see a rollout from it.
Even installed correctly some Lizard wraps can cause a bumping as it rolls because of the flat spots. If the wrap groove was off a little a normal leather wrap could cause some noticable wobble also.