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Id have to see in the GUI where you selected this start datetime from, but it obviously isn't the start of what you are looking for so just remove it from the report and it will clear up the duplicates.
The likely cause of your discrepancy is that is that the SNMP counter for this stuff is a 32 bit value counting the number of hundredths of a second since the snmp service came up, so it maxes out at 497 days and then the counter drops back to zero, and it also resets if the snmp service were to be restarted for any reason. Pretty uncommon for snmp to restart in Cisco gear but you see that a lot more in the Windows side of the world.
Some quick napkin math tells me that your uptime counter seems "accurate", in that it has reset 2 times and the second time would have been about 13 months ago.
Unfortunately those are just the kinds of limitations that people have to work around when using SNMP, which is a nearly 30 year old protocol.
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Thanks Marc. That makes sense!