The first 6 programs are the apps you chose to show. The second 6 are the MRU (most recently used) programs.
When you switch to landcape mode, the MRU list changes to a single row of icons at the top of the start menu, to use the screen space efficiently.
Welcome to Aximsite!
(Your Packers embarrassed our Lions this weekend
)
Edit: geez, I'm slow when posting from the Axim...