Every time I take one of these tests I get a different result. I just took it and it said I am choleric. Huh? I don't think so...
Perhaps it's because I'm 25% in all of them. I think that mainly I am phlegmatic.
Also, it seems as though people can change over time. I know I have changed a great deal over the past few years, and that has been reflected in my personality, so naturally quiz results would change as well.