Hummingbird minification css error on mobile device

I have problem with Hummingbird minification css as soon as i turn it on plugin destroy header on mobile device? I have opened support invitation so you can see if u get time.
i personally think is some weird problem with cached file.

#Top_bar, #Action_bar{background: #fff !important;position: static;}
This should be #000000 but from some reason isn't.

Recreated ticket