Language switcher does not work on posts page

Hi,

This is my website: http://www.thornhillinvestors.com/?page_id=285&lang=en

When I switch language from English to Russian (Русский) or the other way around on the Articles page (it is my Posts Page) it says NOTHING FOUND.

However, if I go from Articles Page to any other page and switch language there and then go to Статьи (Russian version of Articles page), the Russian version of the page appears.

Please let me know if there is a way to solve this.

https://ww.wp.xz.cn/plugins/multisite-language-switcher/