Two domains mapped with domain mapping, one shows wrong URL

One multisite domain: is mapped to Works fine, is the url that shows on load of website. is mapped to Entering domain name pulls up correct website, but shows /drea in the url.

Only diff I can find is the domain is mapped to, while is mapped to Both are parked, unassigned domains. Both have the correct A record and CNAME record, both have same setup in the settings in domain mapping.

How can I fix it so the url is correct? Do I have to delete the domain mapping? If so, how can I delete the mapping? I don't see a delete button anywhere except in the Site section. Do I have to delete the site?