Help with stairs

[UT_Master]

i have made two pairs of stairs curved up together into an opening in the wall, sort of a door. when looking at the stairs and the opening, the left stair case is glitched. when you walk up it, you fall thru and crater immediatly. any help would be nice. thanks. i'll post a pic in the next post if i remember how lmao :blond:

Master

[UT_Master]

heres the pic of the stairs
-Unzip
-Open the pic
-Post with some help if you can (:

;) :yoji: :yoji: :yoji:

[[FuN]Bl17zZ]

http://img294.imageshack.us/img294/5226/mapmap.th.jpg (http://img294.imageshack.us/i/mapmap.jpg/)