UM/WPML Redirection

Hi, I have a weird problem thats driving me nuts, I hope you can help me.
I have WPML and Ultimate Member plugins, and I have set redirection for one page if user is not logged in, but when unregistered user click on page with Serbian language, its redirects him to English ‘forbiden’ page, can someone help pls.
Link to website is https://www.zeljkoskipic.com/new/forma/?lang=sr
and problematic page is ‘Investiciono Podrucje’.
What am I doing wrong?