Is this a mistake?

Sort:
JayLefler

http://www.chess.com/echess/profile/Computer3-lMPOSSlBLE

chessbeginner77

No. Just somebody pretending to be a chess.com computer.

BlueKnightShade

Note the difference in spelling between the two terms

"Computer3-lMPOSSlBLE" and "Computer3-IMPOSSlBLE"

It is hard to see, but the first letter in the word IMPOSSlBLE is different.