You caused your loss and don't put the blame on Manchester United because if you did your analysis proper based on United past performance, you would not give them a straight win or bet on them to win the match. I have stopped betting on Manchester United for long until, I see that they have really improved. I don't know what's wrong with this club in particular, all efforts made to improve the club performance seems not working out.
I see Manchester United's defeat in the EFL Cup as being due to a blunder by the Manchester United goalkeeper and a missed penalty kick after the match had already ended in a draw. Those are the only minor mistakes I can see, and perhaps in future matches, Manchester United needs a much more solid formation and better on-field leadership, such as a captain. Because a defeat like that really takes a toll on the Manchester United players, but I hope they can remain patient and fight hard in the more important matches this season.