Cannot scan and diagnostics show old server IP

We recently moved our site from one host to another, ever since then Wordfence has been unable to start any scans. Additionally, under Tools > Diagnostics the connectivity section shows an error on ‘connecting back to this site’, I have included the error message below.

wp_remote_post() test back to this server failed! Response was: cURL error 60: Peer's Certificate has expired.

I believe the above error is occuring because the IPs listed by Wordfence for the server are incorrect, this could also be why the scanning is failing. Currently it lists two IP addresses, the first is the old external IP address from before the move, the second is the current internal IP address. The SSL certificate currently in use by the server is valid and works fine in both Chrome and Firefox, the old server however did not have a SSL certificate installed by us.

I have tried reinstalling Wordfence completely, even tried manually deleting any leftover files or database entries but it still shows the old external IP address.