my sealpoint 8 month old is starting to revert to white in places

Is that normal? Her face and tail and feet were very black at 4 months old. Now here legs have turned brown and are getting lighter all the time as new fur grows in. Her face, other than her nose, is also "fading". The under side of her tail is also fading (more than the top side). At the same time, her belly, especially between her back legs is getting dark. It is all very strange to me.