Farms 133 Theme Pack and Advanced Theme Switcher Demo

I'm new here and just playing around with themes and plugins and thought of showing or posting some demos so I could learn.

I installed Farms 133 Theme Pack and Advanced Theme Switcher and made a subsite http://frontnbackdev.com/advanced-theme-switcher/ loaded with Theme Unit Test and WordPress Settings that accompany it and placed the Theme Switcher widget in the sidebar.

One thing I notice is when switching themes and going back to the main which is frontnbackdev.com, the selected theme sometimes overrides the theme of the main site. Clearing the cache solves the problem but it's weird.