Have you recently changed your template also? The following 2 styles in CSS from your template are adding the horizontal bars.
.tm-content .uk-article>div {
border-bottom: 1px solid #ddd;
padding-bottom: 20px;
}
Developer Tools is saying the file they're coming from is gzip.php?theme-8d5eeed9.css. If I remove them, the bars disappear. You can remove the border around the share buttons by adding a more specific block
.tm-content .uk-article>div.scsocialbuttons {
border:none;
}
However, if you're referring to something else as being broken other than the border, please be more specific on what's wrong.
-Melissa