lighting problem

Hi. I'm currently in the process of making a custom version of 2Fort, and i have this lighting glitch with the tower just above the RED sniper spot. I've tried everything using my knowledge of mapping and i can't seem to find a fix. I've attached some screenshots of the properties in Hammer...

i am making a map for a projec i am working on and so far i had no problem with it but somehow when i compiled it today the whole map was black and only the props where ok. i searched the problem but nothing really helped. i tried mat_fullbright 1 too. what should i do?