I had an accidental litter just under two months ago. Their mother was a long haired sable banded and their father was a short haired cinnamon (carrier of the long haired gene) which resulted in the mother producing one male short haired golden, one male long haired golden, one female short haired golden banded, one male long haired sable banded and one male long haired sable (I thought I'd mention this because I feel it could be an important piece of information to help solve the mystery!).
Everything seemed completely normal until fairly recently when I noticed something odd with the coats of the two short haired goldens. They now have a large golden patch from the top of their eyes which goes down their back to the base of their tail and the rest of their lower body is now a cinnamon colour apart from their stomachs. You can only see the major colour difference in person since it doesn't really show up that well on photos. Are there any explanations for the gradual colour change? I have had plenty of golden and cinnamon hamsters throughout the years and I have never came across anything like this before.
Any and all help will be much appreciated