Looks like it wants to eat and is taking it's food from those discoloured leaves. It would be pretty early in it's life to be suffering from magnesium deficiency, so I think your ok there, though it does look like early onset of magnesium issues. I know when im being conservative with my feeding my plants leaves tend to start looking like yours. Your other plants which i assume are on the same feed schedule look fine to me so that's a bit confusing. But then again i'm assuming all of those plants are identical clones off a mother, which they probably around. Everybody grows those stupid fuckin auto's these days so who knows.
But different strains feed differently. Some are heavy feeders, some aren't. Some hate to be watered, some don't. The variables can be vast.
It doesn't look severely over watered, but that can be a sign of it if you have droopy sad looking stature plants. I don't know of any variety of weed that likes wet soil.