Unknown problem

Salt uptake within the soil, once inside the leaves the salt has no way of being excreted, npk enzymes apply every watering to neutralize excess salts I soil, npk humic acid and npk full up will greatly improve nutrient uptake and give the plants a way to dispose of salt build up in the leaves, as the desposited salts can attach to the humic acid in form of carbon which can be disposed of.

Magnesium deficiency. Never cut off leaves till problem is solved. The plant does this to the leaves because it can't find any in soil. So it consumes its stored energy in the leaves to continue. About 1 ml to liter of a cal mag will work. Or some epsom salt will work depending on your grow style. Good luck and happy growing 🌱

don't remove a leave till they've 60% of their tissue damaged the plant will transport the mobile nutrients to other parts of the plant.

I agree with UK420 and would give some cal/mag. Also, I would NOT remove leaves that have spotting like shown in your pictures. The rest of the leaf is still healthy and working and worse case can be a source of mobile nutrients for the rest of the plant.

cal mag Def