Cannot truly separate parts There must be an easy answer to this. I'm in 2.82 and I made 10 dupliverts of a mesh on a plane with 12 points. I made them all real in object mode, selected all in edit mode, did P - separate by loose parts. I thought all was well as I could move each mesh independently and they each had their own origin. No trouble moving them independently etc. However when I go into edit mode for any of the 'independent' meshes, all the other ex-dupliverts are selected too! I cannot make them individual mesh-wise, even though they appear to be independent objects and are listed as such. I cannot even colour them independently. Any ideas?
Edit: here is the file.
The objects in the file you provided in the comments of your question are linked copies.

Select them all together;
press F3 (or spacebar, if in blender 2,79 or earlier);
type &quot;make single user&quot; to find the &quot;Make Single User&quot; command and click it;
in the popup that appears check &quot;Object Data&quot; (see img) and press OK.