wierdest thing- color changing boa

[orchamo]

hey guys, i just witnessed a very wierd thing.
i was on a trip for 2 months and left the care for the animals to my parents. when i returned i had this boa, that went into shed. probably didnt have enough moisture because it got stuck a bit. everything sounds normal - it happens. but with this shed she came out of it with a totally different color. its like she lost some of her pigments. i waited for another shed maybe it will be fixed somehow but it didnt change. ill upload here a picture of her before and after the color change. and i want to ask you, have someone ever witnessed or heard of somehing like this? has any explenation??
the morph was simply a motly. the higher quality photo is the original color.
thank you for you time!