This is typical when using a brushless motor as they don't have can's magnetic feild or brush tension to hold the rotor from turning. It's also typical if you have no motor installed at all. I would say it's not typical if your using a brushed motor...
If you need to check your diffs tightness but both wheels are turning the same direction, simply lay the front wheels on the table. Then the drivetrain can't turn when you try to spin one rear wheel...
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