Hello, @antcuc and @Olele
This is not a bug. You may change the image size via customization in files, find and edit etheme_share_shortcode function (royal/framework/shortcodes.php) – http://prntscr.com/i8l9ed > http://prntscr.com/i8l98a (we recommend making changes in the child theme https://codex.wordpress.org/Child_Themes because you’ll lose all modifications after each theme update).
Regards