Einstein asked me the same question, lol. It is because the mixed types of offers, volume-based and rate-based, are all coming together in the charts. Make it so confusing, I know, still figuring out a way to homogenize the data somehow.

Regarding the CC/SAT, you are totally right. I'll make the chage asap, can't update this post anymore, but is great small detail to keep in mind for the future.