Hi there,
Welcome to SeaTheme forum and thank you for purchasing our theme.
Please go to “Art Theme > Theme Options > Social Networks” , click the red cross icon to remove the extra social link

readmore: https://doc.seatheme.net/theme/art/global-settings/social-networks/
ps: I found another issue on your webpage – a JS error reporting. Please go to Settings>Smooth Scroll, click save, it should be fixed.
Regards!
SeaTheme – FAQs – Twitter – Facebook