Just because they are the same size doesn't mean they are not printed with different material. I felt a difference as soon as I touched one of their cards and I go through cards daily. I think they are going with a more plastic substance than cardboard.
How do they compare to Japanese cards? I heard from my friend who went to a pr that they were similar.
Maybe weigh 50 commons from a previous set and compare to the weight of 50 commons of this set?
If they're making the cards out of plastic like material shouldn't they be water proof?
the non wavy one is probably because it's been pushed down and turned the bumps to nothing.