I guess the same issue was described here - How to edit/update canonical URL?
Unfortunately, @Andre , your cpanel support team colleagues are not aware of what preview.sitehub.io is by saying “Note that we do not have any insight regarding the third-party tool preview.sitehub.io”
In my case the issue with “sitehub.io domain being present in production site meta tags” has now replaced with an issue that there are no domain name anymore at all. All full URLs got replaced with relative to site root URLs
Could you please assist in directing this to the right person, please ?