It's very, very rare for a woman to be color-blind. Looks like you might be, though. Seriously. Seeing some colors that aren't brown as brown is a symptom. For me, it's some shades of green and red. I don't remember the type where some shades of purple appear that way, but I took the image and zoomed way, way in, and it's absolutely definitely purple.
Might want to take a good, solid color-blindness test that checks for all the options. I think the R-G kind I have is the one that's the most common, if I recall correctly, and it could be that RG is the one that has a very low chance of naturally occurring in women. Still, if you see red-brown there, something isn't right, and since you're a girl, you might have dismissed the chance that you're color-blind because the false myth is that women can't be color-blind, while the truth is they can.
Anyways, I'm not a doctor. I just know you're seeing certain shades of colors off from what they are, particularly with a brown-ish tint, and from my personal experience, that's a symptom of color-blindness, so I thought I'd mention it.