Hope everyone is doing well! I have a bunch of cuttings that have rooted in clear plastic cups and they are doing pretty well.  A bunch of them are leafing out but on some of them, the slightest touch makes the baby leaves fall off.  Does this mean I'm overwatering or not watering enough?  The leaves are a healthy bright green color and I have them sitting in a bin open during the day with indirect sunlight.

Thanks!!

As far as I can tell, that is normal - not that it happens all the time, but it is not uncommon. It may reflect the characteristics of a particular variety, the fact the leaves formed before roots, or maybe too much or too little water.  I haven't observed any consistent set of conditions that seems to lead to it. Most eventually grow more new leaves, so I've never gotten real panicky about it. Make sure that you have sufficient humidity, otherwise, just continue TLC.