monikaa2000 on "[Plugin: Participants Database] filtration working only for 3 groups"

Hello again :)

I made four groups and a hidden file filled with "post->post_title" and filtration works fine with three groups, but it's not working with the fourth.

It's weird because I add the same code for each individual site. Except of course the name of hidden field value and other fields.

First code (works fine), "jakastrona" is a hidden field:

[pdb_list filter='approved=No&jakastrona=Książka' search=true orderby="tytul" sort="true" fields="jezyk, tytul, rodzaj, opis, link"]

Second (works fine):

[pdb_list filter='approved=No&jakastrona=blogi' search=true orderby="tytull" sort="true" fields="jezykk, tytull, rodzajj, opiss, linkk"]

Third (works fine):

[pdb_list filter='approved=No&jakastrona=Artykuł' search=true orderby="tytulll" sort="true" fields="jezykkk, tytulll, rodzajjj, opisss, linkkk"]

Fourth, it's not working, nothing appears (screenshot bellow):

[pdb_list filter='approved=No&jakastrona=Dobre_Praktyki' search=true orderby="lang" sort="true" fields="lang, tit, type, des, sitelink"]

The only difference is, that last group is assigned to another link of menu (screenshot bellow).

The funny thing is that I checked hidden value of fourth group and there is "Dobre_Praktyki"..

I tried almoust everything, but with any result.

Could you help me with this?

Screenshots:

https://zapodaj.net/images/61b4ea0e5670b.png

https://wordpress.org/plugins/participants-database/