i cant seem to stop the specularity of my light from passing through objects at certain angles. my floor and wall intersect perfectly (still seperate objects) my light is using Dmap, wall is constructed polygon,(tried a different polygon but specularity still passed through) and ive tried using a poly plane and cube for floor same result. Anyone know how to fix this problem while still allowing my floor to have specularity?(wood bump needs specularity)

Take a look to the left of picture and notice position of shadow, bleed through is marked on the right