PSG players appear like ones who has been fatigued, they actually had a really long run of play from last season till this moment and now they did not get enough rest before the season begun, so they are struggling between not making it obvious their chances of fatigue and still performing as best as they can while trying to still maintain their form and strength, they may not be winning with big margins but they keep getting three points and moving forward, they are not optimal so they will not be really having too many goals or even been able to score these goals in time.
PSG competed in high levels last season, the players cannot fully be effective compared to other team that didn't do much during the break, the mind is willing but the body can't meet up the qualities. It is just a temporal lag in fitness, this is the only time for teams to go heads up against PSG and stand to benefits. Ligue 1 has regularly been PSG titleship, despite the poor performance from PSG right now, they can't lose the championship position to any team.