It seems like what’s happening is that it loads the correct palette for the base theme, but not for any of the components. So the parts of the page that don’t use a component have the correct colors, but the parts that rely on a component load the default Discourse “Light” palette instead of using the palette that’s assigned to the Theme.
From Developer Tools
color_definitions.scss has the correct palette
desktop.scss has the correct palette

theme_174.scss which is a component, uses the default Light palette
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theme_171 is a component that consists of only these lines of css in common.css and nothing else
#banner {
margin: auto 20px;
background-color: $primary-low;
max-width: 880px;
border: 1px solid #999 ;
}
