I have never seen future date, better open a case for future date issue.
Byte Rec/sent are calculated at the end of session. Lets say if there is a GRE tunnel passing through firewall and it was up for 1 year and then went down. In this circumstance firewall considered all packet exchange through out year between source/destination.
May be something similar is happening here.
It's a known software issue on PAN OS 6.0.0 and few other releases: Bug 54347 - Traffic log for ping bytes count incorrect.
Please refer below mentioned Document for more detail information: PAN-OS 5.0.8: Addressed Issues
Bug 54347:- Extremely large amounts of traffic (Exabytes, or Billions of Gigabytes) were showing up in the ACC tab and logs for users. An issue where the date of record showed as starting in 2031 caused the incorrect counter of traffic, due to the date being set in the future. Date verification is now supported to prevent this from occurring.
Hope this helps.
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