Same here, Jonin 2½ star and got 7x Wind Asuma, 1x Pain Jigokudo and 5 Seal Fragments

Oh so if you didn't get the highest rank at least 1 time, you only get the basic rewards and not of your actual rank? Sorry but that's just horrible!! you know how hard it is to get that rank :S
That is really a bad move! so now we don't even get the rewards of our rank, might as well not do arena at all if you can't get to the highest rank :S