Did you tried to change the Setting for "RGB" & "Y Cb/Pb Cr/Pr" (some PS1-Games causes me the same behavior, e.g. Alone in the dark 4, where I recognized that.)?
You can try another cable also.
Your games are all from the same Region, like your PS2?
You have a US/NTSC-Model, so your Games schould be in NTSC (Video-Mode), instead of PAL.
Is the picture stretched, or is your screen "(sc)rolling"?
PS2 V7/DMS3 V2 (FW:2.4b7); Seagate Baracuda 200GB
PS2 V7/CC1.0 (FW:34 hacked v2 BM:2.1.6); Maxtor DiamondMAX9 PLUS 160GB
PS2 SCPH-30004R; NoMod+NoLaser
3xSony MC 8MB
MAX/Datel 16MB with Boot-CD
Custom FMCB 1.8b+ Beta-Build, my AIO 0.5, Sony&xRhino-Linux