Calmag adds calcium and magnesium. Essentially Epsom Salts. Ideal if you have soft water or need a boost if growing under LED QBs for instance.
By its nature it is very caustic to roots at high levels. To be used with care and with understanding.
I suspect amongst issues you have lockout due to a build up of salts so the plant cannot utilise the nitrogen. Let alone the pH issue likely to arise. Measure your runoff to see the level of damage.
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