Hair colour changing dark brown to orange

[Geenwereldkind]

I hope this is the right place to ask! My hair colour has been changing slowly from dark brown to orange in the last year. Started at the front of my head. The back of my head is still normal. While I don't mind becoming a ginger I'm just wondering why this is happening. Took some pictures with my USB microscope so that y'all can see the colour difference.