Check this page:
http://kriesi.at/themes/enfold/product/kenwood-kmix-manual-espresso-machine/
I see these 2 notices above product:
“Modern Summer” was successfully added to your cart.
“Gerbaner Blue” was successfully added to your cart.
This must have been cached from a previous user.as I didn’t these to cart and indeed the cart is empty
Likely this wouldn’t be an issue if user is directed to cart after clicking “Add to cart’ button because the cart page is excluded from caching..
This theme works with well super cache?