fig cuttings question - new growth die off
I recently transplanted 15 Brown Turkey fig cuttings from 100% perlite into 1-gallon containers with a 1:1 perlite and potting soil mix. I had previously rooted them using the baggie method. Anyway, a few of them have started growing well, but the majority of them tend to produce small new leaves only to have them shrivel up and drop off a few days later. I'm wondering why this is happening. I have been covering the cuttings with a cut-off 2-liter bottle to maintain humidity.
Has this happened to anyone else? Any idea what is going on?