Somehow or other I have duplicate joysticks in my Controls Options page ... any way to remove both

and do a fresh install???

Yes, but it's clumsy, buggy, and may produce loss of all assignments. Delete the unwanted profile for the same controller using the Preset Manager at bottom of screen. I had to do that once, but it deleted the wrong profile than the one I asked it to delete.

I think the fail safe way is to make sure both profiles for the same controller are exactly the same, by modifying one of them to be exactly like the other. Then use Preset Manager to delete one of them. That way, it won't matter if it deletes the wrong one. It may also put the wrong name on the one it doesn't delete (it did for me). If so, just change the name back in Profile  Manager.