Yes, I question that as well because in the Tibetan the fourth seal is 'nirvana is peace' whereas in the translation the order has been changed. I also thought that it was the last one because it was added later and originally - for example in the Pali canon - only the first three appeared. Ts.
Question from a stupid student: is there an order in which these 4 seals are usually presented? I have found 2 sources where "nirvana is peace" is said to be the fourth seal... --Sébastien 16:30, 17 June 2008 (CEST)