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Than I have discovered that all the "wrong" listed domains have bought sidewide links at ONE site at the bottom. All the sites which are listed at the bottom are listed in Google for keywords they have not optimized for. There is no rational reason for those sites to be listed in the serps for those keywords and the only reason I can see is, that ALL THESE SITES have bought the same bottom sidewide link at the same site!
I think this is really very strange.....
So I suggest you don't worry that much and be patient. If you are working hard for your legitimate sites and read this forum, you will soon be rewarded.
IMO sitewide links are the worst way of getting backlinks; maybe they help you at the beginning but after they are discovered, punishment is waiting behind the door!
Best wishes for success