Please let us know how they are doing in a week or so. Can you shop somewhere else? My feed stores are running out and I have to come back on delivery day to get mine before they are all sold out again. Now I know why.
I don't see the confusion. I think the feed is bad for what ever reason. You can weigh them now and see what they are like in a week on the new feed. They are not getting the nutrition they need. They are old enough to add some meal worms to their diet just because they are behind and meal worms...