Lines under social media icons

[NumNum Village Idiot Find all posts View Profile Close NumNum]

Any idea what would cause the lines under the social icons as seen below, the username is also underlined?

[glennrocksvb Founder/Coder Find all posts View Profile Close glennrocksvb]

It inherits the default anchor link style of the site. To fix this, add the below custom CSS:

.b-sharing-menu__item-link {
    text-decoration: none !important;
}

[NumNum Village Idiot Find all posts View Profile Close NumNum]

The reason I ask is that it is only visible on one theme.

[glennrocksvb Founder/Coder Find all posts View Profile Close glennrocksvb]

Yeah it depends if the theme has underlined links by default. The solution is to override that default for the share buttons as shown in the CSS code I posted.