This might be the fallout from all of the flipping/trade-in madness that was happening a while back. Folks would buy a Bronco they had ordered at MSRP, then immediately sell it to CarMax,
Carvana or some other such entity for a tidy profit. My guess is that you are seeing a bunch of vehicles that wholesalers overpaid for at the height of the market, and now cant unload without a substantial loss. Just a guess but that is my take.
These vehicles may also be imported from Canada, I know that US dealers were starved for inventory knowing that the sale prices were extremely high. If you look at the Carfax, I wonder how many initially shipped in to Canada.