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Malformed DNS response

Helping look at a DNS issue on a production system. Most of the DNS is all good but they were seeing problems from a particular test client. The packets captured here are from a different one (the other party are in a different timezone so I can't test the specific client at this time). But I noticed that for the NS query for root (which won't be much good as we won't allow them to go to the root), I see a malformed response, according to WS. I'll probably find the time to trawl through the RFC, but it would be appreciated if anyone quickly point out the issue, and what could be causing it (I can't imagine they have rolled their own DNS server, but it could be a really badly configured zone file, I dunno).

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