Hello user,
Thank you for contacting iubenda Support Team.
WooCommerce checkout may contain billing and/or shipping data, and in some cases, they do not match. There is only one data subject because the possibility that the billing data person enters the shipping data of another individual is outside the GDPR legislation and is not considered processing personal data under GDPR. It is therefore correct that our Consent Solution saves the billing details that refer to a data subject/interested party which in this case is relevant for the purposes of the GDPR.
Do not hesitate to contact me if you need more information or assistance.