Looks to me like the plants on the right are suffering/recovering from the ph issue. (paleness, the 'claw' deformed leaf fingers at their base)

Do you by chance move those bags around, or do you take care not to disturb the roots?

Is there proper drainage? How much water and how often?

Beyond these questions, filling-out the troubleshooting form is your best bet for a complete analysis. (link is in my signature)

Mg is rarely the solution. It is good at masking real symptoms and can damage your ladies, though. epsom-salts-not-miracle-cure-thread.html