This is abslutely normal when experiencing depression. It's not always debilitating sadness and misery all of the time, you will have days which are better than others and are easier to handle. Just because you can find it easier to get out of bed or be productive or function better on some days, it doesn't invalidate the struggles that you experience on others. Speaking from personal experience, it's very easy to question whether you're 'depressed enough' or to feel guilty for still feeling a sliver of joy or happiness, but judging yourself will only make things more difficult.