If you are doing transactions through P2P you cannot definitively identify the source of funds and the sender are the same individual and you might receive funds from hacked bank and UPI transactions. I never said the OP knowingly did any illegal activities but if you are receiving funds from hacked bank accounts then you will be booked and you need to explain what really happened to the investigating agency.
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Investigating agencies have their right to take proper explanation from the account holder who got the money from hacked bank account and its a part of investigation. I don't think anyone need to worry for that if he have confidence that he is clean or haven't done anything wrong. In a situation like this its better to cooperate with investigation team and giving proper information which will help investigators to detect actually what happened.