Hi,
First of all, be aware that whatever happens in your website has absolutely nothing to do with Zoom Effect.
I have done some tests on your website to figure out if our Dropdown shopping cart was creating the problem or the product updating in the AJAX loading is the problem itself.
Step1: Our Dropdown shopping cart is ENABLED:
I have added the same product twice (Size:6 and Size:10)
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Then added Size:6 again, nothing has changed for the quantity. It pretends like the product was added to cart for the first time. The quantity remains 1 for the Size:6 in the cart
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Step1: Our Dropdown shopping cart is DISABLED and official VM Shopping cart module is published:
I have added the same product twice (Size:6 and Size:10)
Then added Size:10 again, the result was the same, the quantity wasn't updated. But this time things get even worse. The Size:6 became Size:10, and i saw 2 products in the cart and both of them were the exactly the SAME, both were size:10. Which is even worse result than what our dropdown shopping cart gives.
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Then i thought, maybe the problem was the "custom field" you picked. Because it was a "custom field plugin" not an ordinary "custom field". So i did the testing by using another product (Cape sleeve blouse) that doesn't have "custom field plugin". (by the way, in this test, i have enabled the Zoom Effect to be sure that failure has nothing to zooming effect)
I product i used for validation is this:
postcodefashion.com/shop/dresses/cape-sleeve-blouse-detail
Everything works perfectly, quantities are updated correctly. So it is definitely the "Custom Field Plugin" you used.
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Where did you find this "VMCustom - dropbox" plugin? Have you ever thought, the "problem" was causing because of that plugin?
All in all, i have done every possible combinations (THAT YOU WERE SUPPOSED TO DO) and found out that the source of the problem was "VMCustomg - dropbox" plugin. Remove that plugin and use Official Custom Field that comes with the Virtuemart Component (use "Cart Variant" type custom field). Don't use any 3rd party plugins if they are still BETA. You may check this forum post:
forum.virtuemart.net/index.php?topic=99678.480 and read the complains about it.
This topic can be closed, case solved.
Regards.
Support & Development