I think it's a bug.
When my Marketo account Language is NOT English, "Unapprove" isn't shown at "Email Action" after approved.
"Approve" is still shown.
UPDATE:This issue is happen in all languages without English.
Email Action menu (Incorrect)
Context menu (Correct)
Email Action menu (English)
In your images, it looks like the first 5 all have options to "Approve" (the green check) an email. The bottom tow do not have that option, but do have an unapprove option. Did you approve the email while you were changing languages?
I'm looking into this and seems to me it is a localization bug.
I will file a bug report internally.