The harvestcraft foods appear in dungeon chests as the majority of the chest. I found that this is because the loot table files say "chance: 5.0" when this is supposed to be a decimal value. So in this instance (and all of the others, since all of the harvestcraft items in the loot tables have "chance: 5.0") it should be "chance: 0.05" (assuming it was intended to be 5%)

my bad, it was hunger overhaul adding food to the loot tables incorrectly