@Randomblame here you go...
First two pics are 3 hours after lights on and the second two pics are 3 hours before lights go out. So after 3 hours and after 17 hours of light...
I have seen this only one time before with only one plant and it has disappeared after I flushed her. I only fed them from below and they did not have enough water. I do not know how heavy or wet yours pots are, but you can try one or two first before flushing them all out.
DLI could be also too high and 16h would be enough. I would try 30-35Mol/d for a few days.