This can happen becuase your payment was NSF on the original try. Then the IRS sends a notice. The clearing house may wait and resubmit the payment which in this case cleared.
you can check your account balance at the iRS if you have registered
https://sa.www4.irs.gov/secureaccess/ui/?TYPE=33554433&REALMOID=06-0006b18e-628e-1187-a229-7c2b0ad00...
otherwise, you would need to call to make sure everything is square.
you may receive a penalty notice for the bounce payment
penalty
payment amount $1 to $25 amount of payment
payment amount $25 -$1250 $25
payment over $1250 - 2% of payment.