gREEn7o0answered grow question 3 years ago Weird, had difficulty posting another message, accidently deleted other suggestion..
Anyways, I looked at the plants these were cut from, noticed they had green stems (thought the purple may have been a genetic trait) these clones have purple and are losing their foliage from bottom up (signals it's mobile). I'm thinking it could possibly be a magnesium deficiency.
Are you hitting them with anything that has magnesium in it?
also
Are the temperature and humidity from your grow condition correct?