Plugin breaksdown when changed language of the site

Where can we see the website in question?

For example at https://aviatorgamespribe.com/

If i will change the main language of the site it will show 404 error

it started working now. So sometimes after changing it works and sometimes gives 404 error))

Also i want to know how to change og.locale?

What other plugins and theme do you use on the site?

Hi!

Plugins:
All in One SEO
FileOrganizer
Google Analytics for WordPress by MonsterInsights
Head, Footer and Post Injections
Nofollow for external link
Redirection
SpeedyCache

Wordfence Security
Yandex Metrica

SpeedyCache Pro

theme: Blogread (parent BlogData)

P.S. Also I want to tell you thank you for the best language plugin!

Try switching to the default theme, deactivating all plugins excluding Bogo and Wordfence Security, and clearing all cache data.

Why you are advised to deactivate plugins and switch to the default theme.

Hi! Tell me please, why pages now creates at folder en-US but the main now en-CA. For example now i creates About Us page https://aviatorgamespribe.com/en-US/about-us/ why its not https://aviatorgamespribe.com/about-us ?