On all pages where there is li or td on line 12 of one or the other, is strange.
Lost the line, and in the editor that such nonsense with links to other sites.
The link to the site https://www.bn53.ru/katalogi/vse_proekty.php
In the screenshot the highlighted li houses KM-2, but it is not visible in the browser, instead...
circled in red in the screenshot.