Can you re-add the device ? Capture all custom attributes for later use, delete the node on Solarwinds and re-add the same again.
Try re-adding the device, its probably because of SNMP (as node was added via SNMP + ICMP Poll) that the changes aren't reflected.
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NPM 11.5.x pre-dates Windows Server 2016. As such, it can't display an OS version that didn't exist at the time of its release. You will need to upgrade to a 12.x version of NPM for this issue to correct itself.