Admin Configuration Menu items change with language selected

Upgraded from 1.39
The original database has same languages, with Japanese as the default.
The site is working properly, but in Admin I only get the full list of Configuration menu options if I select Japanese. The other languages show only the items I have entered in as "extra_definitions" items.
Doesn't kill me, because I can switch to Japanese to select the options, but it would be good to know what I should fix to make this normal (in case it is affecting something else).
Thank you in advance for any suggestions!

I think this addresses it.

https://www.zen-cart.com/showthread.php?215964-only-one-language-in-the-admin-configuration-menu-options

It looks to me as you forgot to update the English language files to the current version you are using.

Design75:

It looks to me as you forgot to update the English language files to the current version you are using.
That was my first response, missing language files but why does this other thread say only 1 supported? Thank you.

lruskauff:

That was my first response, missing language files but why does this other thread say only 1 supported? Thank you.

The menu titles are multilingual, and stored in the language files like english.php. Constants like BOX_CONFIGURATION_MY_STORE.
But the actual configuration titles, descriptions and values are single language. Those are stored in the database

Thank you for taking the time.