Macbook pro charger melted!!??? the pin and the contact are bust

my sister has a macbook and the plastic around the two pins on either side of the (mid 2010 new design) charger, and the plastic around the two outer contacts on the notebook melted and went black, and the pins sunk into the structure of the charger. My sister started to use my charger (which i think is the same charger or similar charger), i dont know what happened to the charger, but when i used it with my Macbook Pro the same thing happened, only this time it was with one of the pins on my charger, and the corresponding contact on my macbook. The Macbook Pro still charges, haven't checked the Macbook, but i dont want to charge anything at the moment - just incase i cause more damage.
Can someone please tell me what's going on and why this is happening, and how i can fix it. Is it a hardware problem with the charger? the notebooks? both? maybe a software problem - a virus causing it to happen? maybe there's a problem with mains? maybe the fan doesn't work properly and the laptop heats up and melts the port? really need to sort this out - before i start university again this september. I want to have an idea of whats happening or to rule out any illegitimate reasons before i decide to go to the apple store. I find it strange that it happened to both our notebooks.

The genius Bar is well-equipped to deal with Physical problems like this. Take all your gear to them and have them diagnose the problem. No charge for the evaluation, in warranty or out-of-warranty. But they are crazy-busy so DO make an appointment.

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