So do I. I think they just added all the 600,000 together when at the top it says 600,000 US units. To me it says that ALL of North America is getting a total of 1M units.
That's the same thing I initially thought. But if you add up all the units that each chain is getting you get 600k. Which so happens to match the 600k on the right, which could possibly be the 60% of North America units.