Advance Search is not working properly

Hi!

Just gettin started with all this, and have some problem with the search engine in directory theme. My site adress is:

https://uczgry.pl/

Its in polish.

I have only one search field for test – its default texonomy with listing categories. And I added one listing in “Pianino”, but its not working in the search.

When you choose “Pianino” from the list it shows no search results…

Whats wrong with that?

Ps.Sorry for my english:)