Why is the ajax request not being processed?

Question

1C-Bitrix

Hi all. I had such a problem. There are 2 hostings. They have the same PHP versions. There is a site on Bitrix. Combat site and copy. There is a Cart, in which the counter is updated via ajax when a product is added.
So on one hosting - everything is fine, ajax works, without reloading the page, the counter works.
On another hosting, the counter will not be updated until you refresh the page. The sites are exactly the same.
Prompt where to dig and in what there can be a problem.

Answer 1

Your ajax sends a request to add to the cart and on both sites this part is performed.
But the answer (updating the counter) on one site does not work, well, that's how you need to deal with this part of ajax'a. Or at least throw off the code of this part of ajax'a so that you can be helped here.

Answer 2

See browser debugger...