Swift garbled my visitors display

I had to deactivate the plugin, first I thought it could be a hack, so I reinstalled everything, but then I noticed, when I was logged as an admin, everything worked fine, so I started deactivating cache plugins, and then when I deactivated yours BAM! everything went back to normal. I used the default values in the wizard.

The page I need help with: [log in to see the link]