Strange non-existent pages in search results. What is the reason?

Question

Google

There is a site on Joomla. With a search query in Google, some strange non-existent pages with hieroglyphs in the titles are displayed in the output. Yandex does not display such pages. What could be the problem? Checked for viruses, nothing seems to be there.

Answer 1

Google itself wrote under the site:
> This site may have been hacked
Click on this link to see more details.
Look at the small arrow for the cache version of these pages to see what the content on your site looked like at the time of indexing. Google doesn't pick them up out of thin air.
Make sure nothing/no one on your site can create left links, and that you don't have left sitemap.xml, left data in .htaccess, etc.
If these pages 100% no longer exist and no one except you can create pages on the site now, non-existent 404 links will disappear from the search results after some time (2-4 weeks).
Sign up for Google Search Console (and Yandex.Webmaster), where you can upload the correct sitemap.xml, keep track of the index, and see which 404 pages the search engine spiders have found.

Answer 2

last-child() selects the last element relative to the current parent. Doesn't work as expected because a is the only one, it's the first and last element in li.
It will be correct like this:

.navbar-nav li:last-child a {
   border-right:2px solid red; 
}

In general, in such cases it is more appropriatelast-of-type()

Answer 3

Because your attribute a is in li, it is the first and last there. But does it have a last-child, because there are several of them.

Answer 4

.navbar-nav li:last-child a {
   border-right:2px solid red; 
}