It's not supposed to happen in solo play but there's no reason to believe it's not now working incorrectly like so many other aspects of this game. From the FAQ -->
The colored ball you see next to player names in multiplayer lobbies is their Multiplayer Game Completion Percentage. It represents the percentage of the time the player finishes a multiplayer game. Green represents excellent completion percentage, Yellow represent good completion and Orange represents below average completion. The value are determined by the player's last 100 multiplayer games.