current-menu-item

I just can’t figure this out yet again, I’m very sorry to bother you, I tried several things and try to look up how this works, but I keep failing..

I have 2 different menus, one for NL one for EN, and show them on the right translation. That works, but when I try to visit the links. The Dutch menu displays 5/5 current-menu-item classes, but the English menu; 2 from the 5 links get current-menu-item class, while the other 3 on visit don’t get the current-menu-item class.. I’m totally lost, I’vet ried anything within my reach, can you enlighten me a little? 🙁

https://wordpress.org/plugins/ceceppa-multilingua/