I had the same issue, but i fixed it by editing the plugin.
I used php to strip the line breaks and double spaces and it is fixed.
Because i’m using only the shortcode i edited the shortcode file located in:
oss-social-sharing/includes/shortcode/shortcode.php
after the line 82 i added
$string_cln = trim(preg_replace('/\s\s+/', ' ', substr(wp_strip_all_tags($post->post_content), '0', 100)));
and then changed the line below to follow:
$share = '<div class="oss_title_replace oss_horizontal_share" ' . $style . ' data-share-titles="'.get_the_title($post->ID).'" data-share-description="'.$string_cln.'" data-share-imageurl="'.wp_get_attachment_url( get_post_thumbnail_id() ).'" data-share-url="' . get_permalink($post->ID) . '"></div>';
Hope it helps as a temp fix, while @loginradius-dev fixes it permanently and make it even more awesome ??