As I said before at the start of this season, people expected to see a perfect performance from Leverkusen during this season even if they make one mistake that's not right because the Leverkusen fans think they should still stay unbeaten and they should still win the Bundesliga title while even a great team like Leverkusen can sometimes be made mistake and lose points but this is not a reason to say they are weak.
Leverkusen was not going to stay unbeaten again, this is simple football logic I expect the fans to have really understood before have the unrealistic expectations of the team, since the erra of morden football, I doubt if there have been a time any team has been able to maintain an unbeaten record at least twice in a row, so expecting Leverkusen to have done that is really crazy, they should be applauded for their last season performance already and allow them do that which they can do in this new season and not necessarily trying to keep hopes high for them and later feel disappointed. The most likely realistic achievement they can really get at this point is winning the bundesliga title this season but unbeaten again is typically far from it.