The theme your currently using is no longer being maintained and will be removed in a week. The default theme is called "Mach." You should check it out.
So what should you do? In the footer in the lower left side there's a link to change the theme. It's probably the line of text that says "Shadow Realm" Click it and select Mach as your new theme or you could wait and in about a week it'll automatically go to the default when the theme is removed.