You've gotta run out and get a pH test kit NOW and do a runoff test. That isn't good.
Also I am seeing that looks like pots with built-in drip trays? Rip those off and I'll bet it's wet under- tip the plants out of the pots and I'll bet the bottom couple inches are totally waterlogged.
You need excellent drainage growing a fast-growing plant like cannabis indoors, adn that type of pot doesn't provide it.