In my case ran a packet capture between the switches and the Splunk server. Using this Splunk article I calculated the times and Splunk was correct. https://docs.splunk.com/Documentation/StreamApp/7.3.0/DeployStreamApp/UseStreamtoingestNetflowandIPFIXdata#How_NetFlow_event_timestamps_are_calculated It appeared to be the switches misreporting the time. I was planning to follow it up with the switch vendor, but we went in a different direction so I don't have any further updates, sorry!
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