Missing Purchased Apple TV Content

Hi guys. I purchased a full tv series (18 episodes) some time ago from iTunes which I am now able to download and view via the Apple TV app. But it seems that 3 of the episodes are missing and when viewed on the Apple iTunes Store it says I have to purchase them again, despite it saying at the top of the screen that I have purchased the whole series. I have checked this on my iPad, my MacBook and on Apple TV via my television and it’s the same in all cases and all devices are up to date with software. Any advice or known issues would be greatly appreciated!