Getting Duplicate Movie downloads

Hi,

I would be grateful if some knowledgable person could help me.

PROBLEM

After purchasing and downloading an iTunes movie or music track, a duplicate appears - which I think is the iCloud version)

This duplicate appears usually the next time I purchase something.

I have rung the Apple help line about this before, but it hasn't resolved my problem, and I'd like to understand where / what the issue is please.

MORE INFORMATION

Here is a typical iTunes display taken today.
Today I am downloading the movie 'Battle Royale'.
This has caused the issue to appear in a previously downloaded movie called 'Black Sea'..

... and above you can see the movie 'Black Sea' that I downloaded fine a couple of days ago has now a DUPLICATE 'Black Sea' entry which has appeared underneath.
This is offering me to download it from the cloud.

If I try to delete this DUPLICATE 'Black Sea' then I get a message 'Are you sure you want to hide this Film?'

I know from past experience that I can delete the original entry, and download the duplicate. But that's downloading each movie twice.
I also am suspicious that the duplicate download offering does not give me an iTunes Extras.

Thanks for any solution.

PS
Apologies if this is the wrong section... I could not find an iTunes section.