There are infoblock elements, but Bitrix gives a 404 error, what could be the reason?

Question

1C-Bitrix

There are elements of the infoblock,
the symbolic code is written everywhere,
but Bitrix for these pages gives a 404 error,
and only for 3 pages that belong to the same subcategory of the infoblock,
in other cases everything works OK,
what could be the reason?

Answer 1

Are the categories taken into account in the NC settings of the infoblock and component?
Are the other elements of the infoblock where 404 not observed included in the sections or do they belong to the 0th level of the hierarchy?