invisible quantity text

Topshop is a great theme to start an webshop with, and works great with woocommerce.

But I have one problem with it. If a customer wants to change the quantities of his products on my cart page. The text of the quantities will stay invisible in the small quantity option box, it will update the quantities, but the text stays invisible. Therefore the customer will get confused and irritated.

Is there a solution for this problem?

are more people identified with this problem?

Can anybody help me?