When I plug one of my nunchucks into the motion plus module it does not recognize that it is there. Plug in a different nunchuck and it works fine. Take the problem nunchuck and use it without the motion plus module for something like boxing and it works fine. Any help would be appreciated.

I'd raise it with Nintendo. Could be a bug; could be a bad Nunchuk, who knows?

or maybe its a ghost?

It may be a hack nunchuck because the same thing happend with the one that I got from china.