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Google makes about 500 changes to their algorithms each year. It is likely that either one of those changes, or a change made with your site or backlinks, caused the change in results. If you can share the URLs and keywords involved then more direct feedback can be offered.

Mag and Ryan, thanks for the replies.  That is what I thought as well when they brought this all up.  I did some research and didn't find anything.  I thought maybe I missed something and there was some new, better way to keep rank when changing URLs.

This question still remains unanswered, why did it get marked answered?