Oh, I love amateur psychoanalysis! The jinx might be that you are so sure you are going to lose, you subconsciously sabotage yourself in your picks!
How is that for mumbo jumbo?
(Of course, that is exactly what it is...pure mumbo jumbo and bologna!)
The proof that it is a nutsy theory is what you did to me the last time we were matched up in this game! Pure luck is all it really is, either yours or mine. Bonne chance!