"Zwei" is the one data point in the top left corner. The entire top row is 2,12,22,32 and so on, after 12 all these numbers start with "zwei" in German, and are therefore among the last 10 numbers alphabetically in this range. Happy coincidence that 12 just makes it into the last 10 digits alphabetically to not mess this up.
Thanks now I get it! I assumed only the first letter counts, so every number that starts with z should be on the same height