Translation disappear after new post

Hi!
I’m using on my site WPAdverts plugin (classified listing plugin), site is translated to Rus (default) and Est (secondary) languages. So problem is that, after i post new advert, then all my translations to language Est disappear and return to Rus. Disappear translations for categories, subcategories etc.
I tried to find any solution on Your forum, and found a topic with similar issue: https://wordpress.org/support/topic/translation-is-missed-after-new-posts/#utm_medium=referral&utm_source=facebook.com&utm_content=social

Will be thankful for any advice!
Regards!