CSS minify bug - not working optimally

[scorchsoft]

If you view the css file at the top of this page you can see for some reason the CSS hasn't properly minified (i.e. is not most optimal):
http://dev2016.gems-studio.com

This is an issue as it causes Google Page Speed Insights tests to flag the resource as needing minification
https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fdev2016.gems-studio.com%2F

Here are the included files and css
files.zip

and here is the call to the extra:
[[MinifyX?
&minifyCss=1
&cssSources= /assets/css/font-awesome.min.css, /assets/css/bootstrap.min.css, /assets/css/hover-effects.css, /assets/scss/style.scss
]][[+MinifyX.css]]

Notice that style.scss is SCSS and not CSS.