Scoreboard tablist colors breaking

I own a Minecraft server, that was recently updated to 1.10. once the server had been updated to 1.10, I noticed that my scoreboard colours were messed up. whenever I created and tried to join a team, I would join the team, with the name tag colours for about 30 seconds, before being added to a weird team with random numbers and letters. Screenshots below show what happened. they were taken within about 15 seconds of each other.