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If the movies were purchased from iTunes, then they will automatically will be added to "the cloud".. if you downloaded them to your Mac then that will supersede the iCloud version for that device. Easiest way to confirm this is.. if you have an iOS device.. go to the "Videos" app and the movies you purchased should appear there with a cloud symbol next to them(unless you have automatically download to device set as an option).. another means of doing this would be to remove the movies you downloaded.. they should still appear in your movies but again with a cloud symbol.. hope this helps..

You may also find these links useful..

https://support.apple.com/en-la/HT204088
https://support.apple.com/en-us/HT201272
 
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