That's enough Scratch Grains as a daily treat for 16 fully grown chickens. 32 Bantams.
My hens get a 1/4 cup per 2 chickens, Max. So 5 chickens, 5 ounces on measure cup, Max.
I would dump out the feeder and wash and dry thoroughly.
If you've had the feed a month stored outside or a couple of months in your house, toss it. Otherwise
Check the feed in the bag. If it smells medicine like or a moldy smell or you see mold, toss it.
If it's powder and used to be crumbles or pellets, it's got grain mites, toss it and buy fresh. GC