Peanuts may contain traces of peanuts

My question after reading the label of a packet of peanuts was; if it only contains TRACES of peanuts, what is the rest?

Yummy Snack Foods 500g peanuts
Yummy Snack Foods 500 gram salted peanuts
Peanuts may contain traces of peanuts
Peanuts may contain traces of peanuts. So what else do they contain?