Aaron, I suspect that the visible code <span class='p-author h-card'>Aaron Davis</span> which appears on your byline on your site is the result of the uf2 plugin https://wordpress.org/plugins/wp-uf2/ conflicting with your theme, which already has microformats baked into it. You should be able to disable that plugin without any ill effects for any other functionality while simultaneously getting rid of that visible span. If that's not the case, you might want to file an issue at https://github.com/pfefferle/SemPress.