Happens for me too. Try to change my email, it asks for my password, I enter it, it goes back to the profile edit page and pops up a notification that the email was changed and the change email field is blank, but the email in the upper left of the window is still listed as the old one. On refresh the edit profile page shows the old email in the upper left still and in the change email field again.
Seeing this made me realize I haven't changed my email since the one on file doesn't exist anymore. And I'm getting the same error too, I edit the email, it asks for my password, it says it's changed, but nothing has changed.
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Shoot me a PM with the email you're trying to change it to and I can do it, in the mean time.