Apparently many Tracks have the left and right tail fins on the wrong sides. I didn't know until I read about it and had a look at mine and indeed they were factory swapped. It's purely cosmetic and an unknown issue until pointed out as it does not affect anything, but it's very easy to fix. Here are photos of the incorrect and correct configurations. The angles at the ends of the fins should align with the curve of the rear of the car.

Fix: the fins pop out with your hand and then can be pushed back into their correct sides again by hand. No tools need. 10 second job.

The nontabbing leg fenders in robot mode, the floppy hips, the gaping front fenders in car mode and the incredible (read: breaking) amount of force to unpeg the windcreen in car mode are stories for another day...