Weird, CIT uses a shader to hide these pole wires. Try deleting all resources in your local MTA folder. (default path: C:\Program Files (x86)\MTA San Andreas 1.5\mods\deathmatch\resources).
I've had this problem three or four times, I've applied to the same solution every time and I've had positive results.So what have I done? Let me explain.First, completely remove GTA:SA and MTA from your computer.There's a lot of files left after you delete them, and clean them up.After you do these things, reinstall the game and the problem is solved. You need to follow the steps correctly.