For more information about how Net Adjusted is calculated you'd want to have a look at this:
Guide: Net Adjusted Winnings GraphsIf you find any errors in the calculation of Net Adjusted Winnings then please include all relevant information detailing the problem (calculations, screenshot(s)) and send us the original hand history(s) for review and the tournament summary file(s) where applicable in a
Support Ticket.
If you are not currently saving tournament summary files we recommend that you have them set to save in PokerStars (Settings -> Playing History -> Tournament Summaries) and set to import into PT4 (in Configure -> Sites & Import Options -> PokerStars).
Guide: PokerStars Tournament Summaries