Duplications on multiple instance of add to cart

Hello
Sometimes we use multiple add to cart buttons on a same product page, especially if it's a long one.
If I use more than one, there are duplicate ids, function plusval() and minusval() are duplicated.
Because of duplication of #qtyinput, the second plus minus modifies the first input's value.
JSON schema is also duplicated

We will look into this and fix it in our next version release. Thank you

For your information we have fixed the requested things in our latest version. Thank you