RVR Color Sensor Not Working

Our team’s rvr seems to have an issue where the color sensor can only recognize the colors red and yellow. Using the Sphero Edu app, we have the rvr set to look for green and blue and set the main LED to green and blue respectively, however when it runs over those tiles nothing happens. We have tried multiple times, and we have not found a solution. If anyone could help, that would be greatly appreciated.