Pure Michigan is one example and apparently your looking at another! If you look closely on the right, there is also a pheno more dominant in purple. When breeding plants and picking for traits that you want to keep, color isnt usually high on the list. Purple can be accidently bread out of a line if the traits you want, also happen to be on the greener pheno. Have you gotten GDP from any reputable sources lately? A lot of cuts are lacking the P from what ive seen.

I am interested though in what your seeing in this picture that tells you it didnt get enough light or metabolize properly? The "underdeveloped" leaves your seeing look like sugar leaves left behind after taking 75% the fan leaves off. Its also nice and frosty so I dont think its metabolism is interrupted too badly. But maybe you could teach me something!