An "Imported Obj" is not a well-defined phrase but my first inclination is to presume you used the OBJ Import dialog. In which case, a prop with its own geometry was created in memory, no reference to the Obj file, which can now be deleted - a thing I've done a thousand times. So if you clone that imported obj, you are making full copies of it, not instances that all refer to a common, single "loaded obj". What I'm saying is "loaded obj" is shared, "imported obj" is not.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)