I'm surprised no one has any ideas. Maybe this will help. Hope you can see it.
View attachment 2817302
Also, I found this (sic):
"...red stems and leaves curling upwards is mag def. red stems and leaves curling downwards is N overfert. brown patches or spots with light coloured leaves is underfert N P K levels are too low. brown spots are an indication of potassium def. just add fertiliser with a good npk ratio. 2.1.1 for veg and 1.2.2 for flowering."