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Generally, this is how NTA works to resolve hostnames:
The timeframe is set in Settings -> All Settings -> Product Specific Settings -> NTA Settings -> DNS and NetBIOS resolution.
One thing you may want to do is switch DNS Resolution from Persistent to On Demand and reload your page to see if that resolves the IPs.
Additionally I was going to share that NTA won't retroactively update hostnames so if you're playing around in a report, you will want to test this against your resources on your summary pages to make sure you're set going forward: