During a single axis move, why do my other axes offset their position?

When I move any one of the axes on my PCI-7344 card I get a positional offset on the other three. when I stop the move, the other three axes return to their approximate starting position after a couple of seconds. I am measuring this offset with an electronic indicator. This error occurs in MAX and in Labview. I have isolated the motor cables and verified shield and ground connections. Do you have any other suggestions on what to look for?

Thank you Evan, I already solved this problem. My analog ground had actually been tied to the digital ground through the Trust servo amps. Once I isolated these two grounds the symtoms disapeared.

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