Maybe you cane help me on this topic.
I have setup theme my login on a page with two languages (english and german) – everything works well ?? only if you are update your profile page on the german page it redirects to the english page after pressing the “safe profile” button.
The url before press the “Profil speichern” button looks like this
…./de/login/?action=profile
then after the update
…./login/?action=profile&updated=true
Maybe there is a little workaround for this