is this the first batch out of the bucket?
One thing I do when I get a new bucket of salt, before i open it, is shake it up, roll it around, and generally treat it like a can of soda I intend to give to someone I want to play a trick on. It only makes sense that different components of the salt mix are different sizes, and settle slightly during shipping.
a word of advice though, let it sit for a few minutes before you open it after you have gone 'a shakin' as when you peel that top off, there will be a fine salt dust plume... probably don't want to inhale that.
"Maybe in order to understand mankind, we have to look at the word itself: "Mankind". Basically, it's made up of two separate words - "mank" and "ind". What do these words mean ? It's a mystery, and that's why so is mankind." ~ Jack Handey