I was able to figure out that there are multiple entries that mean the same thing, and others that you wish you had. I figured out that to "fix" it, I went to the View By section and selected all the ones that had "mistyped" names, changed my stamps to use the more logical entry, then deleted the ones that had typos. In some cases, I just used properties to fix the typo.
I now have a clean pull-down list for my stamps that works easily.