Style.css (?) problem with the minify mode

Hello,
#1 I created this topic, because I think I did everything and I have no more ideas what else should I do. I also wanted to raise the ranking of my site. That was the first reason.

#2 Practically and “probably” problem relates to the style.css file, which I tried to minify using, of course, W3TC. Only this file, when I add it manually, crashes the entire page and makes that everything is rearranged. Of course, when I turn on the auto mode, the same thing happens.

#3 I checked two different themes that I have right now (Ubergrid from Pukka Themes and Breeze from bluthemes). Both have the same problem with this style.css file. Both smash page in the same or similar manner.
I contacted with bluthemes support but unfortunately, they couldn’t help me. They did’t have too much in common with W3TC.

#4 For now, I have nothing, because, when I turn off minify or only the style.css file, ranking of my site is lowered to 70+, which is quite bad.

Page address: http://smartass.ninja
Style.css file: http://smartass.ninja/wp-content/themes/ubergrid/style.css?d5e7f8

I don’t know why there is d5e7f8 after the style.css text.

Thanks you in advance for resolving this annoying problem.
Lucas

https://ww.wp.xz.cn/plugins/w3-total-cache/