[i18n] Current menu item duplicate in another language

I have a multilingual taxonomy menu, which works as expected (multilingual select filters out items not matching user's language) except for one thing: whenever I click an item in the menu, when it opens the page with related content listing, the menu adds a duplicate of the clicked item in the other language; In other words, if I have 4 terms in the menu, 2 Russian (say 1 and 2) and 2 in Romanian (say I and II), on the home page in Romanian view i see I and II and in Russian view i see 1 and 2. But if in Romanian view i click I, then on the next page the menu would have three items: I, II and 1. It's the same with all other items.

Looks like the clicked item (and/or its translation) loses the correct language setting. If I move away from the taxonomy term-related listing page (e.g. go to homepage or open one of the content nodes), the menu is back to normal.