Yep, something's wrong with the way they make the discs I think. I use my Sharkport disc the most, and it's got the same problem. I usually line the red part of the disc to the ps2, sometimes it works but sometimes I'm sitting there for 10 min trying to get it to work. When ever it starts clicking, it's not going to work.
Also, for some odd reason, my GT1 and GT2 have problems loading in my ps2. Like they load so that you're past the ps2 menu, but then they just stop. I don't know what's up with that, as when I fist got my PS2 they worked fine. Ohh well, once you play GT3, GT1 and 2 look terible...