It appears that the NPLB server is updating the dynamic DNS route correctly.
I have confirmed that the server is reporting the correct address and is updating the dynamic DNS index with the correct address.
I have to suggest that there is a setting on the router connected to the server that is the issue.
Perhaps the port-forward rule is bound to the old MAC address of NIC on the old motherboard.
I cannot resolve it from here.
If Max has some time he may be able to help check the router config,
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