Aguarde dois ou três dias e verifique novamente. É muito provável que mostre sua partida "no devido tempo" sem nenhuma ação exigida por você. Enquanto isso, certifique-se de manter seu cartão de embarque. Se após uma semana ainda não houver registro de sua partida, veja EUA Alfândega e Proteção de Fronteiras que inclui:
If you departed by a commercial air or sea carrier (airlines or cruise ships), your departure from the U.S. can be independently verified, and it is not necessary to take any further action, although holding on to your outbound (from the U.S.) boarding pass - if you still have it - can help facilitate your reentry next time you come back to the United States.
e:
If you are a VWP visitor and you left the U.S. by an air or sea carrier, you don't need to worry.
e:
We strongly urge you to keep a copy of what you send to DHS-CBP and carry it with you the next time you come to the United States in case the CBP Officer has any questions about your eligibility to enter. Carrying those materials with you will also allow your record to be corrected at the time of entry if, for some reason, the London, Kentucky office has not yet done so.