I have four chickens getting close to a year old now. They had previously been eating pellets just fine though one i had noticed was scraping out pellets with her beak but would normally eat them. Now at least two if not more are scraping out all of the normal sized pellets and picking out the smaller bits. I figured out what was going on by hand feeding. They'd throw all but the crumbs and small pellet pieces on the floor. Now I'm finding feed all over the ground all day! Are they just being picky or could this be an indication of something wrong? They have access to the outdoors (free-ish range) on average for anywhere between 6-11 hours usually though some rainy days its less. I have a hanging feeder set at back height with the fingers (not one continuous trough like the waterers). Any ideas?