The Current usage pie charts are incorrectly scaled, and therefore visually misleading. For instance, the Megabytes chart says 401 out of a scale of M (500). This pie chart should be 80% full, but it is only 75% full. The denominator appears to be 400 where it should be 500,
Under Messages I have 1594 out of a scale of L (2000). This pie chart should be 75% full but it is only about 60% full. I can't guess what the denominator is.