Do you mean the same movie showing in different hubs (e.g. recently added and recently released)?
What’s wrong with that if a movie is in multiple categories like this?
Result: Every new videos show as duplicates. There is no physical file that are duplicate but plex now list all new videos with duplicates entries. In other the words Movie ABC is show twice or more on Recently Added Movies.
On which exact version of PMS are you experiencing this?
Does this persist if you reload the page / restart the player and is it consistent across different players (e.g. Plex Web, HTPC, mobile / big screen apps)?
Added/Linked the new libraries, unfortunately two linked libraries where link to the root instead to the correct folders, ie Drama Movies and Animation Movies. So it was scanning the root on the new drive instead of the folders. That’s why there were duplicates.
Once I linked it to the correct folders the duplicates entries were deleted immediately.
I found the mistake by accidentally looking at the animation library and found non animation movies listed.