Background of the issue:
We have been facing the issue since we updated the plugin. Some blog pages are translated into the Belarusian language. We have checked all the settings we have not found anything related to the Belarusian language. Link to a page where the issue can be seen: hidden link
Symptoms:
Instead of the blog pages being in the French language, they are showing in the Belarusian language.
Questions:
Why are the blog pages showing in the Belarusian language instead of French?
How can I change the blog pages to display in the French language?
After reviewing your website, it seems that the Belgian language is a custom language. You'll need to ensure that Belgian is mapped to the French language in WPML → Languages → Site Languages and then click on Edit Languages. After doing so, you'll need to translate the page.
I conducted some tests locally using the Belgian custom language and mapped it to French, and the page was translated into French.
What will happen if you retranslate this page in WPML → Translation Management? Please go to WPML → Translation Management and set it to automatic translation.