Local font works great except on author archives and 404 page

Hello!

I’m hosting fonts locally (and preloading them) and I’m using this CSS:

@font-face {
    font-family: 'Source Sans Pro';
    src: url('wp-content/fonts/source-sans-pro-v21-latin-regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: optional;
}
@font-face {
    font-family: 'Source Sans Pro';
    src: url('wp-content/fonts/source-sans-pro-v21-latin-600.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: optional;
}
@font-face {
    font-family: 'Source Sans Pro';
    src: url('wp-content/fonts/source-sans-pro-v21-latin-700.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: optional;
}
 body {
	font-family: "Source Sans Pro", "Georgia", sans-serif;
}
 h1,h2,h3,h4,h5,h6 {
	font-family: "Source Sans Pro", "Georgia", sans-serif;
}

Pages and posts display Source Sans Pro except for the author archives (http://tinyurl.com/bdfjdd6r) where it shows Georgia.

Any idea why that might be? I tested with removing clearing the cache and deleting all the CSS, but the issue persisted.