Degraded video signal with install of Magic 3.1

[neomut]

I have recently had a magic 3.1 installed in my Ps2 (PAL V3). Every thing runs fine, but I have noticed that there are diagnal line running down my screen.
They are really only noticable at image edges and when something is at a distant.
It make me think that there is nosie on the video signal or something as such.

This was not happening b4 the mod... Anyone know what the prob could be?

Cheers
neomut