If you bury cards in computer and than use iPhone to sync, the numbers of cards waiting for review will be the same as computer at first. But if you quit Anki and open it after a while, the cards waiting for review will recover to the numbers when you have not buried cards. And at this time, even if sync, the numbers of cards in computer and iPhone are always different.
I’ve created a separate post to track this issue: Inconsistent card counts when syncing