I just bought a Dual-Shock(Clear Blue) at the goodwill today for $3

But it's working odd with me...I tryed it with Doom on the PSX, it like going down(Like when ou go to Deathmath, Doom or Doom 2..I can't really explain it, it's like pressing down. the D-pad dosn't respond or the Buttons..Selete & Start does..In Street Fighter Coll. It make everyone duck..Any Info