Unfortunately this is not an old issue, I just needed to went, as no one from Apple seems to care one bit.
Most likely, because you're from the US. And Apple couldn't care less about other countries.
My US store is way more neat with updated covers compared to my Danish store.
Movies covers in the Danish store, just looks like Apple searching google for the first available cover, and then use that. I have other movies with covers describing them as Unrated, special editions, directors cut, ect. without actually being that.
I even have a movie "Just Friends" which is bought as HD, and still shows as available to on HD in the store. But the version you get, is SD. I have made a case with Apple on this. They refunded the movie, so I could purchase it again, as it should work. But it didn't, still only SD. And now total silence from Apple, and it's been years, and still not fixed.
In space (Apple) no one can hear you scream!.