The reported inventory date reflects the date as it is set on the client computer. So I suspect you will find that the client on this particular computer was at some point in the past (and possibly still is) set to a date in 2038.
It can be a little tedious to recover from that: even if the date on the computer is set back to an earlier time after it was previously set to 2038, FlexNet Manager Suite will compare the date on inventory data that is subsequently received and see that it is older than then 2038 date and so discard it. I think you may be able to get past this by deleting the inventory device and discovery device record for the computer in the UI, and allowing it to be re-created by the next inventory import. Be aware that you will lose history and allocations associated with the device when you do this.
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