YSlow says JS files is not compressed

Hello there!

Thanks for a very great plugin! Amazing how developers can work magic now-a-days.

However, I do experience some troubles while analyzing with YSlow. It tells me the JS files handled by WPMinify is not compressed. See report: http://gtmetrix.com/reports/tandregulering.info/OvflISKZ

My live website: http://www.tandregulering.info.

Can anybody help out?

http://wordpress.org/extend/plugins/wp-minify/