Hello Coraline,
Please, note that the “Address” field is required by default. We also could not recreate the issue locally: when we made the State / Country field (un)required, the Adress field was still required on the Checkout page.
Please, note that it is possible to make the “country of residence” and “Full address” fields unrequired in the Accommodation tab > Settings > unclick “Country of residence field is required for reservation”.
Best Regards,
Mary Evans