I am clear on your quest but not clear with your description.

You say "layering" and to me this means same column and directly above or below.

I have never seen this in all my HHonors stays. I only see the one post in the left column which adds directly to the HHonors points posted to my HHonors account and the right column which is posted to the airline FF program.

From what you indicate or what my reading of your comments are you have, in some cases, received two sets of airline partner points posted to your HHonors account balance.

TW