items won’t add to cart

[ Moderator note: title adjusted, please refrain from using help, urgent, emergency, asap, etc. in topic titles. ]

After I updated yesterday, my cart won’t work adding items.
When you try and add an item it says:
Please match requested format: Qty
No matter what quantity I put in, I get this error.
Please help.
check out the “shop” here and try to add items to your cart:
https://charitycollective.org/store/shop-here/