@Spangle
No need to get worried as your car is equipped with single wheel e-brake not both. Hence when you pull the handbrake only one of the wheels locks.
I would not recommend this rather have you look at the Owners manual but if you were to jack it up from the rear you would notice a single cable going to one of the rear brakes.
So no need to get worried, what you have is totally normal and comes from the factory.