Try not to have another copy of parent theme's stylesheet in child and @import line above at the same time.
Keep editing here and there without consideration on how the theme's markup is constructed and how the CSS is applied will result in a much harder to fix and debug especially when the parent stylesheet is used like that.
In CSS, things that come after will override the former, this is how the system works. In other word, only use @import and only make changes needed down under.
