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When testing a zone with 2 NS that point to the same IP... #140
...you correctly get a NOTICE due to DELEGATION02 that says "SAME_IP_ADDRESS" (this is cool and actually more detailed than DNSCheck), the problem is that DELEGATION01 has already passed this domain as this test only checks the names then continues.
So what Zonemaster misses is that this domain only has 1 NS, this is not the case with DNSCheck so something's missing.
You can try on "rayceem.com" for example.