troubleshooting Question

DNS setup for public DNS - 2 DNS servers 1 at ISP 1 in our on prem DMZ

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philb19 asked on
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Setup of DNS - 1 in my DMZ and I in ISP location - public DNS servers

I'm receiving feedback from some external experienced engineers that the above setup is weird. I sense there my be something wrong - but from what ive researched this is good practice.
They are both primary authoritative name servers for our public domain. - there is no zone transfer between them.

The ISP controlled DNS is frustrating to a degree as we need to ring them frequently to get unusual entries completed. EG SPF records. Then I need to place the same record in my DMZ on-prem hosted DNS server (which i can do myself easily). So there is double entry required.
The question I'm asking is is this an unusual setup for public DNS for an organization?. Whats wrong with it ? Thanks
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