[SOLVED] Not refreshing shopping cart

In opencart 2.0, when changing the amount of a product in the shopping cart in checkout/cart,
the shopping cart refreshes the first time.

But when I change another products amount, it doesnt work anymore.
Only when going to another page and then go to the shopping cart again it suddenly refreshes.

Luckily we have found the problem:
It was located in the common.js file, so we updated that file again and the problems were gone!