I solved the Issue which was coming from the title-tag support and the way it handles the document title parts. I simply wrote this filter to return an empty tagline when on home/front page.
function document_filter_parts( $title_parts ) {
// Alter the tagline output.
$title_parts['tagline'] = '';
return $title_parts;
}
add_filter( 'document_title_parts', 'document_filter_parts' );
Thanks for your help anyway.