SSL Certificate is not being issued over ipv6

This issue has been causing me grief for months,

Half the time my website seems to issue a secure certificate and the other half it seems to issue a invalid one,

testing it on SSL labs (https://www.ssllabs.com/ssltest/analyze.html?d=onepizza.com.au&latest) it seems that the correct one seems to correspond with the ipv4 address, and the incorrect one to the ipv6 address.

I can’t find the incorrect one anywhere within my cpanel directory. And recently just purchased the SSL Zen premium to have access to support, if someone can help me that would be great thank you.

The page I need help with: [log in to see the link]