Robocopy always says New Dir for the same directories every run

I'm running robocopy with the following settings

    Files : *.*
        
  Options : *.* /S /COPYALL /PURGE /MIR /ZB /NP /R:1000000 /W:30

But comparing logs over the last couple weeks, it always does the same set of folders as "New Dir" in the log, when they definitely aren't new, they're the same folders that have been there since the initial run of the script that created it.  But it never creates them in the destination for some reason, so I would think it should be erroring out instead, right?  Some (maybe all) are empty directories.

Any ideas how to fix it?  it should be skipping these directories by now.