When you arrange your albums at me.com/gallery, you may notice that they are randomly rearranged after you log out and then log in to MobileMe. This reordering is not reflected anywhere else, such as at gallery.me.com/username, on your iPhone, and in iPhoto; each program, device, and application displays photos, movies, and/or albums in a different random order.  Also, when you upload multiple photos or movies to an album at me.com (either at gallery.me.com/username or me.com/gallery), they are posted in a random order.

See more here:
MobileMe: Rearrangements of photos, movies, or albums done at me.com/gallery do not save or reflect in other devices or applications

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