Looks to me like possibly a lockout or woefully underfed or more unlikely a root pest.. What is the runoff numbers and feeding numbers?
I can't go by ml/g, need ppm/ec and ph, watering frequency etc..
Ppm won't work in
biobizz soil/nutrients had that issue last time , the ppm numbers are all over the place for th organics, we ended up overfeeding them by around 200+ml of feed because we tried to go by ppm when it doesn't work lol.
PH the massive put itself to 6PH just using it on its own, didnt have to ph down or up it.. but my friend didn't recheck the numbers 10minutes later so it may have changed lower or higher in PH which could be the issue.
Watering frequency are every 4days or so.
Not sure if massive works in PPM so could always try read it next feed.