cssmin generate CSS larger than before

[aristotekean]

Hi, I have the following configuration

    cssmin: {
        target: {
            files: [{
                expand: true,
                cwd: 'assets/css',
                src: ['*.css', '!*.min.css'],
                dest: 'cssmin',
                ext: '.min.css'
            }]
        }
    },

but generate css larger than before of 22 KB to 44 KB, someone is have a idea why is this happening?

[XhmikosR]

It's the new clean-css defaults. Either way this is an upstream question.