White lines on map.

I was on a server that I usually play on for HL2RP and noticed these white lines everywhere on the city17 Industrial v1 map. I’ve no idea where they have come from but if anyone knows a fix it would be appreciated.

http://cloud-4.steamusercontent.com/ugc/28484282741064362/050EB4862240CBE100DFB9049DF1BE6351C03ABC/

Do you have this addon http://steamcommunity.com/sharedfiles/filedetails/?id=395887791 ?
I had this and it caused the exact same problems, the map creator is aware of this