Corrupt Cartridges?

Now THIS is bizarre.

 Just bought a copy of Milon's Secret Castle for the NES the other day. We cleaned the living hell out of it, and the NES, but the game insists on having a corrupt graphics set(which was the same every time, tested on two NES systems).

 Both systems also produced a hole right in front of Milon at the game's start which dropped him to the top of the screen. The castle itself is a glitchy mess, and there were no enterable doors that I could find.

 We also have a copy of Jackal that has a crash that is reproducible every time that occurs when firing missiles(thus making the game unplayable).

 Does anyone else have any strange corrupted physical ROMs on cartridge? And how is this even POSSIBLE?

It's perfectly possible, in the same way that any other electronic device can malfunction. Sometimes chips just go bad, sometimes from static damage, sometimes from being inserted badly, sometimes from poor connections on the PCB, sometimes just at random. It needn't kill the chip entirely, but damage certain areas that result in symptoms such as those you described. Unless it's something simple like a dry solder joint on the board, it is beyond practical repair.

sounds weird, but my Ninja Gaiden I copy only works when I plug a Game Genie with it (it doesn't need codes, though).

I've seen of his apartment

I can look up inside the cartridge, and I can see where somebody cut away part of the interior.I'm pretty sure the cartridge was counterfeit from the get-go.http://www.easycap.org/Easycap_DC60.html

milons shitty asshole

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