Green keys limited to a few

Hi, I noticed that green keys, those that I use for soloes & melodies let me use only a few notes for each chords, not all them: is it normal or I set wrongly something?

for example, here the xml of Experimentaler Scaler-State_2020-10-14_011037.xml (7.7 KB)

I have apparently a dozen of green keys, but about half of them are mute or give the same note