It seems the buttons have a strange color that doesn't match anything else on the site.
I actually like them. It's a nice color (whatever it's name is). It adds a bit of life to the (kinda) dull theme. Also, note that the same color is used for the bronze badges.
This is by design. The buttons need to stand out a bit more. Also the orange tone is complimentary to the blues used elsewhere on the site.