You may be noticing a "recombine" step for several files on the recent dumps which simply seems to list the same file again. That's a bug not a feature; fortunately it doesn't impact the files themselves. I have fixed the configuration file so that it should no longer claim to run these, as they are for the parallel run function which is not needed on the smaller wikis.
I'm thinking about whether or not to clean up the index.html and md5sums on these to remove the bogus lines. Doing the index files would be a bit tedious.
Ariel