Hummingbird Minification

Hi, I'm not sure how your plugin works. I keep doing the "compress" on the suggestions when I go to that screen on the Hummingbird plugin, I click "compress" and then "publish changes" however nothing seems to change and every day i go back and the same ones are being suggested as being minified. also, i keep testing the site after i make these changes on and it seems the site's performance has even gotten worse. can you assist?