Polylang issue with Serbian Cyrillic

Hello,

i’m using Polylang to translate our website in two languages, one is in albanian and another one is in Serbian/ Cyrillic , means latin and one non latin alphabetical.

the issue is like this : on page load for first time its showing correct language but after full page load its mixing some words inside texts, news, menus and so..

i tried to use old database backup, old source code, but not fixed..

i tried to deactivate polylang then it was working correctly and displaying syntax correctly after i reactivated it again same problem, means the problem is directly to polylang configuration,
make sure that i have not changed anything and it happened itself maybe from any automatic update or don’t know why.

can someone help me what to do please?

on this link there is some content inside,
go to this link : https://bujanovac.rs/%D0%BF%D1%80%D0%B0%D0%B2%D0%BD%D0%B8-%D0%B0%D0%BA%D1%82%D0%B8/

See example of error : Службени гласник br 10/17 (this is the correct syntax) and see how it looks in the web.

The page I need help with: [log in to see the link]