This week almost all the favorites failed to get maximum results, Bayern Munich had to draw with VfB, Borussia Dortmund had to suffer a defeat to Leipzig, the most recent being that Freiburg failed to get full points at home to Borussia Monchengladbach. It's a bit surprising to see the results of this week's match, that they failed to capitalize on a win.
They also managed to thwart a lot of bets but even though it was a bad result for them, at least this kind of result remains interesting because apart from the match being difficult to predict at least their competition has also become more competitive. Although indeed, at the end of the season I'm sure his position will not have much change from the previous seasons. But regarding the surprising week, I think their defeat might be because they are preparing for the Champions League match. In the middle of this week they will play against strong teams like Bayern Munich who will play against Barcelona and Dortmund who will play against Manchester City. This factor can still happen, but considering they are the top team in the Bundesliga, they should still be able to overcome the match with the expected victory.