Dyed sheeps drops, when shearing, white wool and wool regrows white after eating. This affects all colors except light gray and gray.

Just thought - my light gray and gray sheep were "natural colored" - so I didn't dye them. All the dyed sheep are affected, as I shear them, the sheared wool drop white and the sheep's wool regrow white after eating grass.

Update 3: After multiple attempt to redye the sheep's, I eventually got to get it right. But still strange, that I had to dye a sheep at least twice or more to stay the wool white after shearing.