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I'm just guessing here, but that sounds almost like the main gear got turned around and the one-way bearing is backwards. The gears should be forced to turn when you push the car backwards, and able to freewheel / not move if you hold them still while you slide the car forwards. This particular...

Could be the one way bearing, or loose set screws. Both gears are engaged and are able to turn without the wheels turning, in either direction?

It's not an issue with the metal ones, that bit is just a solid piece with the rest of the gear.

The issue you're running into is called "gear mesh". You'll notice how the engine mounts in the chassis are slots rather than holes, this is to let you shift the engine around until the gears are just the right distance apart. You can use a strip of paper to set the approximate distance, it...