Looks like clones did not root enough and not able to absorb enough water causing some to wilt. Make sure you give it enough water and let it dry in between watering. Not sure, but, MAY have sign of mites on the two far left pots. Could be something else.... hard to tell. I would check the underside of the bottom leaves and make sure there's no moving dots down there!
I wouldn't go by that moisture reader or even use it... They're not very accurate. Water till you get run off and lift pot everyday to check.... Weight of pot will be quite obvious when they need watering.
They look like they didn't root well and are struggling a bit, I also see the meter, don't use it, they'll make you over water, trust me, I've done it, overwatering could be playing a part in whats going on also.