Grunt uncss cuts out a lot of extra stuff, why?

Question

Grunt.js

Yesterday I started to try to work with this tool.
For the test, a simple template.

uncss: {
                  dist: {
                    files: {
                      'style.css': ['home.html']
                  }
              }
          }

the command is executed without errors,

but as a result it cuts everything leaving a few lines (you can see the reduced size on the screen)

and the comments that were in the css remain.
Tell me what could be the problem.