I have a multilingual website (English and Arabic) where English is LTR and Arabic is RTL.
When you press on the Author name in an article a new blog page opens with SUPOSEDLY all this Author's articles, but this doesn't happen... Only english articles appear.

I want the blog to display all the Author's articles arabic and English.

For ex: www.mobylak.com/blog/mohamed-sahl
This user has arabic and english articles but only english ones are present.

It opens with all the items that belong to the language the parent menu has.
Make sure that this menu item is for all languages.