Blond hair, but dark eyebrows?

when i was younger my hair was bleach blond, however when i got older it darkened as did my eyebrows. Now my hair is still blond pretty much dirty to dark blond however it gets lighter in the summer and it has some really light blond highlights (some are natural some were highlighted because i had a sun in disaster). Although my eyebrows are pretty dark, like a brown color. I feel like this is weird, like they should be lighter, any thoughts?