Theme Switcher Help

I’ve installed the theme switcher but for some reason when you choose a theme other than the default when you leave and come back it goes back to the default theme. I’ve had many people go to my site to make sure it wasn’t just me and it did the same to them. The same thing happens when I click on content pages, it goes to the default theme.

My site is http://silencehurts.org/ any help would be appreciated.