Your rejections are becoming odious and in many cases incorrect duolingo! Kindly alter you ACCEPTANCE PROTOCOL! Both answers mean the same thing. All your rejections do is cause students to find what answer suits your protocol rather than study to learn the language. Your rejections create a confusion is the mind of the student and this can create more error!
Which answers are the same? One thing I would keep in mind is that there's a difference between "this kitchen is spacious" and "this is a spacious kitchen". Also, this tree is still in beta, so patience is key!