It means your differential gears are working right and you don't have a limited slip carrier. The axle connected to the wheel on the ground stays stationary, and the other gears rotate around it. As long as both wheels have traction, they pull equally when the driveshaft turns the ring and pinion. The axle speed differentiates around turns to allow the inside wheel to turn a shorter circle. All differentials work that way, even the ones with limited slip capabilities.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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