Liberation Peak (Breakthrough) has terrible balancing
The first objective in particular is the culprit. It's almost impossible to take for the attackers unless the defending team is seemingly braindead.
I've seen this so many times on both the attacking and defending side. From the attacker's perspective, there isn't enough alternative routes towards the single objective. It's either going to be the hill on the right of the road that offers next to no cover, or trying to make it through the rock formations on the left of the road, which heavily favors the defending team. Going far left isn't really an option either because it takes you away from the objective and doesn't really offer a viable route.
The fact that the match begins with just a single objective to take also plays a part. As soon as two objectives are in play, the match noticeably opens up and becomes more fair. But in what feels like 70% of matches it doesn't even get this far. In practice, all attackers are funneled into a tight corridor at the start, just to be picked off from the defenders.