First, why does the Admin show up as a Standard membership or why would he show up as a standard member if that is not normal? - not sure exactly why - just how it is setup, but in normal circumstances has no relevancy on the admin account. Admin has access to everything.
Second, when I go to Admin panel to change my password, why are there several names there? Like test, admin, and my login name with capital letter and lower case? - I noticed in Firefox that anything I type in a field is "remembered" by my browser. I read once before that there is a way to change this but have not done so myself. So, if you have typed any of those into any previous dolphin password fields, and have never cleared your browsers cache, it is remembering those entries.
Third, is there a place to eliminate those extra names? - might want to look up (regarding the browser you are using) how to not store passwords
Hope that helps, it;s my best guess.