Domain forwarding to cluster

Good Morning,
Im having a stressful time at the moment. My clients site was hacked. I then had to back up from months before.

After this ive managed to restore it to a point where i can see the website. However everytime i go to the site, its redirecting to the cluster. Which doesnt have the SSL so its saying the site is not secure.

Can anyone advise? Im probably missing the most obvious thing ever but i just keep getting frustrated and support arent really advising

Thank you