After you file

I talked to a person at IRS and they said they did not receive my return until 2/5/2020.  According to turbo tax it said accepted on 1/31/2020.  So according g to IRS they are still within the 21 day period and my return is still being processed.  My question is why do the IRS not receive my return until 2/5/20 if it said it was accepted on 1/31/20?