Bitrix:catalog.section CNC not working?

Question

1C-Bitrix

Hello guys, help me, I've already broken my head these days.
There is a section /catalog/
where I display all elements of the catalog using catalog.section
There is an IB catalog
URL of the section #SITE_DIR#/catalog/#SECTION_CODE_PATH#
URL detail #SITE_DIR#/catalog/#SECTION_CODE_PATH#/#ELEMENT_CODE#
These paths are the same in the component settings .
But when clicking on the element 404 error. Created a separate file detail.php Element not found.

Answer 1

in the infoblock settings are the same paths?

Answer 2

hover over the element, at the bottom of the browser on the left, look where the path is formed?

Answer 3

maybe in urlrewrite some rule above overlaps