Domain Mapping Tool redirecting to my core website

Hi there,
So I have domain mapping installed for my wordpress multi-site. It works successfully for my other domains, however, with a website i recently migrated over and imported, every time you type in the domain, it redirects to my core

At first, I thought it was because I incorrectly set up my domain etc. However, I was able to rule out any hosting problems. The set up looks exactly like my other domains already mapped and working. Could you please help?