I wrapped your DNS records above in “code” tags, and now I think I see what the issue is…
It looks like you’re missing “A” records for your two NS records.
Both ns1 and ns2 would need to have “NS” records, which are correctly in there now.
But they would also need corresponding ‘A’ records, which define what the IP address is for both.
Try adding that, and see if that resolves the issue for you.
-Eric