Hello,
I have passed your issue to our developers, I will inform you once I get the answer.
Meanwhile, could you take a look at another our theme XStore. Blanco theme is out of date a little bit because was created a long time ago. Xstore is new and powerful theme with many versions and layouts. If you want we can give you the refund for the Blanco theme and you’ll be able to buy XStore instead. I’m sure that XStore does not have problems with the cart items.
Tell me what do you think about this proposition?
Regards