Disable Minify CSS

Hello,

I am trying to use the plugin called CSS-Hero. (This is a visual composer of CSS on page)

The plugin works visually, however the CSS changes do not take effect. The support tells me this is because of the plugin on my site that is Minifying CSS, and the only plugin on my site that does this is WP Fastest Cache… Whenever I try to disable these options, the settings do not save, in other words, I cannot uncheck the option to minify CSS.

Any advice would be appreciated.

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