Initial DNS record resolution checks show that your DNS records are conflicting. You have multiple records that are not resolving correctly.
GridPane checks DNS records are resolving to the server IP prior to applying for a Let's Encrypt SSL certificate. This protects your domains from over running your weekly quote or from Let's Encrypt blacklisting.
Please ensure your DNS records are set properly and resolution has propagated.
If you are using services such as Cloudflare or Sucuri, please ensure that they are not masking the server IP while you enable your SSL certificate.