[2D] when i flip the player, the boxCollider2D bug

Hi,
in my game, when i flip to 180 my player, his box collider isnt the same, so when i jump over a quad with another box collider, it gives me this[37223-sans+titre.jpg|37223]

I dont know how to fix this, do you have any idea? Thanks

ps: all the boxCollider are trigger except the one with the guys.

i understood what you said and i think it s that but i dont know how to modify the position of the pivot. Do you have any idea?
Thanks

i found this for people who have the same problem:

http://solvethesystem.wordpress.com/2010/01/15/solving-the-pivot-problem-in-unity/