why does lost have only 100 episodes on netflix, instead of 120?

on my bluray player ive been watching "lost" on netflix. however in
it, it only says there is 100 episodes (ex: im on the '80th episode'
according to netflix, yet in the description it states that it is the
milestone 100th episode)???? also, on my cousin's netflix, on their
wii, it says "lost" has 120 episodes, as it does on the internet as
well.

whats wrong with my netflix?? please help soon im a lost fanatic and i
dont want to miss anything! and please im only on S5:E14 so no
spoilers!