Hi,
To resolve this issue, you can go to the Dashboard > Appearance > Editor then find the layout folder in the right hand open the social.php file and find the line 54.
Replace the following code:
<?php if(get_option($gk_tpl->name . '_tweet_btn', 'Y') == 'Y') : ?>
<script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script>
<?php endif; ?>
With the following code:
<?php if(get_option($gk_tpl->name . '_tweet_btn', 'Y') == 'Y') : ?>
<script type="text/javascript" src="//platform.twitter.com/widgets.js"></script>
<?php endif; ?>
See the screenshot: http://prntscr.com/lnyudo
Regards,
Hope this helps!