iTunes purchases on iPad not registering with Macbook iTunes.

Hello everyone.

I've purchased and downloaded films on iTunes via my iPad. However on my MacBook Air, when I go to the iTunes store it still requires me to pay for the same films in order to download them.

Both devices are connected to the same iTunes account, and from what I can see, match is on. Yet somehow it's like they're seperate.

The MacBook Air automatically downloads the iTunes Extra content associated with the movies, but not the films themselves.

Any ideas?