i don't have too many pics on my computer, here's one.I don't think it 'messed' them up per say..everyone in 2017 has a preferred method of raising chickens it seems. Egg laying hens have crucial vitamin requirements, especially modern production breeds and is extremely taxing on their little systems. Having said that the calcium content and the other things in layer feed isn't much higher than chick starter, the later having a higher protein percentage for development. Your grower feed should be at or around %18 protein, while layer typically is around %16. At the point you are introducing them, they shouldn't need to be on a starter any longer with access to grit.
If they are not laying though, you could actually just use a non layer feed type as some sources believe non laying birds can have adverse reactions to excessive calcium in their systems. Such as fatty liver, digestive issues and kidney failure and potentially ovulation issues since they are not using that calcium for production. For instance I have my 'dog' chicken that I keep in her own cage for various reasons. She decided to molt a few weeks ago, about two months later than the rest. So she is on a feather builder regiment and not layer feed as she hasn't laid an egg since. Show us some pics!