Virtualmart 2.0. Can't switch between languages ​​on the product page?

Question

CMS

Good afternoon. There is a site on joomla 2.5 virtuemart 2.0, two languages ​​(eng and russ). When switching languages ​​- articles, categories, other - switching between languages ​​is fine. When switching the language on the product page in the store, the switch does not occur and the page of the entire category simply opens instead of the product page in another language. The problem appears in both directions of translation.
Help or give at least a direction where to look. Thanks