Are you sure it isn't because they changed to a cheaper material? I noticed about a year ago that the new ones are not as good as the old ones. They don't last as long and they wrinkle more than the old ones when you put them on which to me means they use less material or different amount of it and it's for the worse.
I am now testing out other grips to see if I can find a better product. I hate it when manufacturers try to sneak the changes in and hope customers don't noticed.