Sounds like they were stored wrong by Macks and dry rotted. I have seen other mouth calls that I have had, do the same thing. I never took them out of my vest other than to rinse them off before the next season.
I would call Hooks explaining what happened to the calls and then I would see if Macks would make it right. Scott is a stand up guy from what I have seen and heard on here, I don't think think he would send out junk for all these other people to sell on there webpages or catalogs.
JMO.