problem with search

Goodmorning everyone,
I have a problem with the search field.
When I use the search in the results, the pages and articles come out.
I tried to search for various solutions and I brought to the function.php file various solutions found in blogs but the problem is not solved.

The website is:
https://www.4gghidini.it

Trying to search for 1 will bring up articles and pages.
Pages always appear at the bottom of the search but should not appear.

I thank everyone for the help.