First of all, fuck the water monitor, is it one of those cheap £5 chinese two prong things that does the light, ph and moisture. (I bought one many moons ago....... shite). Ya prob gonna tell me its a top of the range beast
We have been here before, master the art of feeling the weight of your pots to decide if they need water, I would rather trust myself over a gadget.
I had probs with all bar 1 PChunk (5 seeds) sulking alll the time without reason, they would droop every night 2 hours before lights out then would be wide awake at lights on. Thirsty they sulked, post watering they sulked. I renamed mine after the wife. Unstable genetics / pheno, I only kept 1 clone from 5 plants and she is a peach. Ya gorra weadle out the crap over time keeping the best.