Hi @HealthyLiving,
This sounds like HubSpot is automatically recognizing a non-HubSpot form. You would have to identify how the form is created and make sure the form fields are correctly mapped: Use non-HubSpot forms
It seems like that’s not the case, hence the incorrect phone number.
As an alternative, you could embed a HubSpot form on your website. This would solve the issue: Set up and style a legacy form on an external site
Best regards!