Product Addon, price impacting product when option not applied

Hi all,

I have a potential issue, I have a test site waiting to go live, we are using the Product Addons plugin to allow customers to request additional paid-for options to a product.

If a user add a product to the cart with some of these addons selected the cart gets updated correctly. But if the user then adds another of the same base product but without any of the addons selected, when you go to the cart this second product has the first products addons applied to it too.

both these items have the same productid as they essentially the same product just with different addon options selected by end-user

Thanks