help! troubleshooting bug error on cart error

[Neeeedhelpfastpls]

 

Hi all,

 

i am almost done with the completion of my website but dang! this caught me off guard, and i have been at it for hours!

 

When i click on ''add to cart'' for any products, the item does not add loaded into my cart instantly.

Please see image. I will have to refresh manually my page.

 

The link is http://theblackground.com/shop/product.php?id_product=83

 

click on add to cart, and you will understand me.

 

Also, there seems to be a problem with my zoom button, and i think it's the same error to do with the add to cart?

 

Thanks!