I can't see too much wrong with your plant, but it certainly does not have a cal/mag problem.
When growing in pots, it is a bad idea to have different layers of different soil types and this is what may be causing the reaction with your plant as it was growing in one type of soil then the roots have made it to the second layer and this can cause an imbalance in nutrient up take, as it is a bit like changing the plants diet half way through its development.
That is, it was growing in Fox Farm and now it has hit the "living soil", this affects the plants' nutrient up take differently.
Whenever growing in pots, or anywhere really, all soil should be thoroughly mixed into one base type, just like a cake, into one even, well combined and well blended soil mix that provides a stable environment for the plant and its roots.
Cheers, Organoman.