They should make that clear because it only says defeat/victory at the end of each round, and in push there are only 2 rounds. In a 1-1 situation, if the devs want the winner to be determined by best round score they need to add another overall victory/defeat element.
Otherwise if that's not the case, then there should be another round. However, maybe, the team that did get the higher score in the 1-1 situation GETS TO CHOOSE WHAT SIDE (attacking or defending) to play on for the final round with a player vote system before the final round starts. Thoughts?