Both links should be the same–this is what I see in mail my site. However, I note that you have Mailgun MX records on both domains for bulk mail, but no MX for the bare domain, goatreview.com. How are you sending transactional messages such as the sign-up email?
You were right, it comes from the config.production.json. I changed the @pierrebelin.fr for @goatreview.com and it worked well !
I really appreciate your help !