Game gave me all the league rewards, but it shouldn't have

I played 3 league games and never got even a rank, or how you call it, but I got all the rewards. I logged into game and the game said I have league reward to cliam, and when I clicked claim rewards, it gave me all of them up to grandmaster. I am writing here, because I am scared I could get banned, because it could seem like I am cheating.