Removing Duplicate Files In Subfolders

So, I foolishly let a poorly-formed Hazel rule run before previewing it and now there's a bunch of duplicate files in many subfolders. But not to worry, I thought—I can just check "Throw away duplicate files" on that folder with the Apply to Subfolders rule and Hazel will clean it up for me!
But despite trying multiple variations based on what I'm reading in the forums here, it's just not working. I'm sure the answer is simple, but I'm missing it.
First off, Hazel does recognize that the files I want deleted are duplicates (even warning me in the pop-up that it might delete them):

And as you can see I have the "Throw Away: Duplicate Files" checked:

And I'm telling it to look in subfolders:

But despite forcing runs and waiting a day and checking and unchecking that box, the duplicates still remain.
What am I doing wrong?
But despite trying multiple variations based on what I'm reading in the forums here, it's just not working. I'm sure the answer is simple, but I'm missing it.
First off, Hazel does recognize that the files I want deleted are duplicates (even warning me in the pop-up that it might delete them):

And as you can see I have the "Throw Away: Duplicate Files" checked:

And I'm telling it to look in subfolders:

But despite forcing runs and waiting a day and checking and unchecking that box, the duplicates still remain.
What am I doing wrong?