It's funny that Bayern lost points against weak opponents: Bochum and Union Berlin. The next opponent is a weak team again, but since in the last 2 games Bayern lost points against weak teams, I believe that most Bayern fans will have little confidence in Bayern winning the next game. Honestly, the title still seems like a distant dream.
Well, maybe it surprises many, but you know, it doesn't surprise me because Bayern has been very focused on the UCL, they've done well, all their energy has been very focused on the UCL, and the players get tired. Bayern has a very good lead in the Bundesliga. Of course, they have a Leverkusen that isn't letting up, and any mistake or something is reason enough to take advantage.
Given these things, it does tend to surprise some, but that's the most logical reason I conclude.