At any point on the map, when one side pushes back the other, is just what happens when first losing in the PvP. So… It goes as it should? You lose ground when you lose in the PvP encounters? Nothing wrong with that. Alliance can do it too, if they’d ever actually win in those encounters.
Except it’s an advantage to have a closer graveyard. Wouldn’t you agree? Which Alliance does have, to that first clash. So it’s the first clash that sets the tone for the rest of the BG.
When one side is dominating in the PvP, then yes, that’s what happens. If Alliance had enough ability to push 'em back, then they would reasonably be winning from the first clash, right?