Why does the page display a block with a 404 message?

Question

CMS

Good afternoon, help me figure out the site works on DLE and there was a problem on the news pages, a block with the message “This page does not exist, a 404 error occurred” is displayed at the bottom joxi.ru/8An5b3Nsj4KnJ2
Although the page with the news is displayed.
What could be the reason for the error?
It is interesting that there is no such error on static pages, only in the news.