Out of 110 cubes you got the Rank B reward, including the diamond anvil rolls, 21 times.
21/110 = 19%
Out of 110 cubes you got the Rank A reward 6 times, NOT including the 1x diamond anvil rolls.
6 / 110 = 5%
So in reality, you were beating the average and all your video proves is that IMC is correct in that the 1x Diamond rolls ARE rank B and it is just a visual bug, not a scam.
Sorry.

