Hello,
Please make sure the Extra field is not protected on AnkiHub:
How to manage protected fields
Then, reset local changes again:
How to reset local changes
Also, on Anki’s main screen, could you go to Help > About and let me know your Anki version?
And finally, how long has it been since you downloaded the deck?
Please let me know if this helps! If not, we can continue troubleshooting it further.