The categories slugs have been written in Cyrillic language, which caused the issue.
Please re-write in Latin languages, go to Settings -> Permalinks, and resave them to apply these settings. https://prnt.sc/t4Br6kCdPXGO > https://prnt.sc/IIrg4svKMhED
Thank you. This problem solved but there is a new one.
We use 2 parent portfolio categories.
Each category has subcategories.
There is a conflict when we use 2 portfolio modules on the same page.
On the ALL selection there is no problem.
But when we select a subcategory then the portfolio items of the other portfolio module disappear.