Why are modules showing up as themes?
Drupal uses a function called _system_rebuild_theme_data() to help determine the list of themes (both enabled and disabled) to show on that page. That function does a number of things, but the first thing it does is to look for any .info files within the "themes" directories, which can include /themes, /sites/all/themes, sites/anydirectory/themes.

So, based on the screenshot, it appears that you have some modules placed in a themes directory. I would go through your themes directories to make sure that that isn't the case.