I didn't notice this during the first test, but in the second it seemed almost obvious - when a team pushed forward enough that the other team was at their last point, it seemed very easy for them to defend and because most, if not all, of red was down, the blu team could push forward. Obviously this is more speculation as I wasn't thinking of this until our entire team was down and they were pushing.
Perhaps that's why we kept having the back and forth issue - maybe the last point is easy to turtle? I'm not too sure as we had an impossible time trying to keep the last point whenever they tried to push it.
Just a thought I had.