Why is the URL of the product /catalog/ in the checkout, if all the NC specified correctly?

Question

1C-Bitrix

There was a similar situation in the basket, but I fixed it with the following instead , in which the link looks like ..../catalog/, I put$item["DETAIL_PAGE_URL"]

$arResult["REAL_PRODUCTS"][$item["MAIN_PRODUCT"]]["DETAIL_PAGE_URL"]

on the checkout page, there is no such array ( ), and the value is ..../catalog/, the CNC is configured correctly for the catalog I need to go from the checkout, by clicking on the product to the detailed page, what is the way out of the situation? $arResult["REAL_PRODUCTS"]$item["DETAIL_PAGE_URL"]