After assembly, a certain breakpoint does not respond, who can see the code?

Question

css

https://github.com/fristyr/final
Problem with breakpoints. I left only one test breakpoint in src/css/author.scss
Style on line 13 .author
If media screen and (max-width: 1020px) {
display: none;
}
Set for example not 1020 but any other below for example 750 it disappears, it is in the minified version of the code but for some reason it is not displayed and does not react in the browser.
I cannot understand what is the problem. In the assembly itself or somewhere in the styles themselves,
PS I screwed up a little and it turned out that the devtools do not respond, but if you shrink the browser window, then the styles with breakpoints are displayed, that is, only the devtool does not work, why, I still can’t understand