Rod, the path is Addon Scenery\ Scenery and in it are the duplicate .bgl files. The Scenery Configuration Editor showed it as Addon Scenery\ Addon Scenery but that's not the correct path. I shouldn't have even mentioned it as it just confuses the issue, obviously. Sorry. I do have an Addon Scenery\Addon Scenery folder but it's not related to RTMM, it's a 3rd party airport. I'll attach a snip of the tree, it's right below SAK Skagway RTMM, and two snips of the contents. Probably should've done this in the very beginning.
Spud, I hear ya. I'm notorious for inadvertently right-clicking with my fumble fingers at just the wrong time, like while dragging a folder, and it's uh-oh...where'd that go? Then a year or two later you say, Oh, there's that folder, how'd that get in here? Yep.