Cubase uses “nondescructive” editing. In theory, your original files are never changed. There are several reasons why Cubase might make a copy of a file in order to maintain the integrity of the original file. An example is if you edit an audio event that uses the same file as another audio event (if you duplicated it) it will create a “new version” of the file. It usually asks you if you want to create a new version or edit the file anyway but there may be a preference to turn the prompt off.
I’ve never seen copies that are placed after each other by themselves - I haven’t touched them. All I did was save the cpr with a different name.
Maybe a new behaviour in CB 6 ?