Your Overall Level is calculated using the RULE OF 2's. It's simple, take your two lowest levels, apply two stripes to each of them, then look for your lowest score, and that's your level. You may have some levels in BLUE and PURPLE, but have an Overall Level of YELLOW or ORANGE because of your weaknesses.
Here's the good news. Work on those weaknesses and your Overall Level will improve quickly. Work to continually improve, and keep working those weak areas.