Appointments+ and Domain Mapping

in subsite using a mapped domain, I am getting the following error on the browser console when try make an appointment:

Failed to load https://tara*****.get******.com/wp-admin/admin-ajax.php: The 'Access-Control-Allow-Origin' header contains multiple values 'https://tara***.ie, *', but only one is allowed. Origin 'https://tara***.ie' is therefore not allowed access.