Many thanks for the screenshots!
It looks like the first screenshot is the DNS settings page on the domain providers website. Is there a specific reason why you have those URL redirects in place there?
You should only really need the first two: the A Record & CNAME record. Can you try removing those two URL redirect records, and see if that helps? Because of how you have the domain set up in your Shopify admin, those redirects should already be taken care of as everything is already redirecting to myduckmate.shop. The duplicate ones in your DNS settings might be causing some issues.
Were you able to locate any A Records that might suggest where the 192.64.119.13 is coming from when you analyse the domain here?