Some greens can interfere with absorption of calcium. Spinach, collard greens, chard contain higher levels of oxalates (oxalic acid) which is what interferes with calcium, so should be given sparingly. Scratch and Peck feeds are whole grain, and some birds will pick and choose the bits they like, leaving the rest, which can sometimes lead to deficiencies. A pellet or crumble type feed doesn't let them do that. Just putting those out there as possible contributors.
Excellent information here - thank you! Will take this into consideration regarding the greens. I do soak / ferment the Scratch and Peck. I really appreciate a non-processed food, just like for me : )