Today I decided to move my wordpress site to a new domain. Some of the customization wasn’t there after the transfer so I thought it was because of the missing https of the new domain. So, I hoped on cpanel and ran Let’s Encrypt SSL and tried issuing a certificate.
Wherever you manage your DNS records, just remove each instance of 2001:8d8:100f:f000::2bc.
I'm not 100% sure who hosts your DNS based on the information I can see. Might be in your 1&1/IONOS control panel or it might be in your cPanel account.
If you can’t find them, it might help to submit support requests to both your host and registrar. They will be able to track down where the correct place to manage your DNS is.
You won’t be able to issue the certificate without solving this first.