When I'm on the app, and look at my steps, the three views are 7 days, 4 weeks, and 12 months.
The bars show blue when the goal isn't met , and yellow when they are... except on the 12 month screen, when they always show blue.
At first I thought it wouldn't go yellow if a missed the step goal a single day in the month, so I was excited to see it turn yellow for January today, but no.
So I check the website on desktop and go into the same view, and its green for all but two of my last 12 months!
The app should update the monthly bars as per the website.