Bug, rp_downtown_evilemelon mapping change

So i’am new in hammer and i want to change a little bit of evilmelon and , at the end of the map , in the road i got a BIG bug of ligthning.
http://hpics.li/6f86236

It’s only the road , only this ************ road , i change the materials but don’t work, , again this bug…

Please guys , can you help me ? i just need help, i don’t need flame.

sorry for my bad english guys