It happens. There are a lot of foot problems sheep can get, and many of them cause the hoof to peel. Sometimes the hoof peels and you never find a cause and the lamb never seems to be lame. So keep a watching brief.
One thing to watch is if they get a gap form between the foot and the peeling horn, and get a stone or bit of grit stuck in there - then they may go lame or even get an abcess. You are keeping a good eye on them, so you'll notice if one starts to limp and take action promptly.
I think zinc is supposed to help keep the hooves healthy, and there's a lot of science about which trace elements help or hinder the uptake or use of other trace elements. Frankly, it's boggling and leaves one thinking it's impossible to keep sheep hooves healthy!
Sorry not to be more help. Yes, lambs do seem to cause a lot of work - an old Exmoor farmer once said to me, "Sheep's only got two hobbies - what they can eat and what they can die of."