Bug entrance at Nishidera

[Vermilllion]

Need help at Nishidera...When I enter the dungeon I see stairs...But...I CAN'T GET DOWN THE STAIRS,I FLOAT RATHER THAT GOING DOWN.
PLS NEED HELP HERE, I WANT TO FINISH THIS DUNGEON BCUZ OF MY MAIN QUEST, I still have susanoo and yoshitsune quest so I'am wondering if I need to finish those 2 1st b4 going for Kaguya's quest.....ANYWAY PLS REPLY ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!