I've seen a picture on which 4-3-4 is illegal, what is the cause? [DC, DC, DC | ML, MC, MC, MR | ST, ST, ST]

The same happened on a 4-5-1 formation [DL, DC, DC, DR | ML, MC, MC, MC, MR | ST]

Players with this color are greyed out for some reason in the formation! Does anyone know what caused the 80% / 20% Possession?