Taxonomy filter not working

Something wrong with search.
We have created an asp for custom post type “Obrasci” and custom taxonomy “obrasci”.
And in the top right corner of main page we have this search widget but it wont work properly with all taxonomy terms.
So for first term “Izveštaj o isplaćenim zaradama u javnom sektoru” we got one result and that’s valid
https://proba.cekos.rs/?asp_ls&asp_active=1&asp_force_reset_pagination=1&p_asid=2&p_asp_data=1&current_page_id=14587&woo_currency=RSD&qtranslate_lang=0&wpml_lang=en&filters_changed=1&filters_initial=0&asp_gen%5B0%5D=title&asp_gen%5B1%5D=content&asp_gen%5B2%5D=excerpt&customset%5B0%5D=obrasci&termset%5Bobrasci%5D%5B0%5D=8

but for second term “Poreske prijave – porez na dobit pravnih lica” we got no results (and should got at least one)
https://proba.cekos.rs/?asp_ls&asp_active=1&asp_force_reset_pagination=1&p_asid=2&p_asp_data=1&current_page_id=14587&woo_currency=RSD&qtranslate_lang=0&wpml_lang=en&filters_changed=1&filters_initial=0&asp_gen%5B0%5D=title&asp_gen%5B1%5D=content&asp_gen%5B2%5D=excerpt&customset%5B0%5D=obrasci&termset%5Bobrasci%5D%5B0%5D=10

and problem permits with other terms.
I have checked and we got valid posts for those terms but they are not showing in search.

Furthermore I have tried ASP option to hide terms without posts and those terms are still showing. So it looks like asp knows that terms are valid but not listing posts when selecting those terms anyway.