Are they in corells or is there something else beneath?
If it's straight corells I'd use drip rings or two drippers per container. Otherwise a lot of substrate stays quite dry.
How often are you watering?
How long are they in the system?
And what medium are the cuts/seedlings in?
Usually its hard to overwater in coarse corells. But with a rockwool cube/peat or something the like down there they can get overwatered before the roots had time to spread into the corells. Just reduce to 5 minutes every 4 hours for example if you feel more comfortable that way. But usually 24/7 is no problem in corells.
Had such drooping at the beginning a couple of times myself but it usually stops after a couple days.
As a tip for the future:
You can get crushed corells for horti use or as insulation material or use smaller correls mixed with perlite or straight fine/medium perlite in netcups instead of rockwool for cuttings/seeds. Doesn't matter much what you use as long as its a fast draining airy substrate and nothing as wet as rockwool or peat etc.
Works extremely well with a simple "flood & drain cloner" constantly flooding and draining, with a 1-2 hour break/dry period 2-3 times a day.
Or with a little water in a tray, but that's not as fast.
You can just bury the whole filled netcup as you would with rw Cubes or other stuff, the roots will grow out just fine, no need to remove the netcup and cause unnecessary stress.
Reduces the chances of rotting and water logging, its a way better propagation substrate than rockwool imho. Plus they can start growing right in the cloner and have nearly no transplant shock and transition phase.