The problem are these urls in your code:
https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fwww.koolhydraatarmrecept.nl
data-a2a-url="https://www.koolhydraatarmrecept.nl
addtoany_share_save" href="https://www.addtoany.com/share#url=https%3A%2F%2Fwww.koolhydraatarmrecept.nl
I think that these need to be replaced back to http to make it work. The code would have to be something like this (put in your theme’s functions.php):
function rsssl_exclude_http_url($html) {
$http_url = str_replace("https://", "https://", home_url());
$https_url = home_url();
$http_url_encoded = urlencode($http_url);
$https_url_encoded = urlencode($https_url);
$html = str_replace('add_to/facebook?linkurl='.$https_url_encoded, 'add_to/facebook?linkurl='.$http_url_encoded, $html);
$html = str_replace('data-a2a-url="'.$https_url, 'data-a2a-url="'.$http_url, $html);
$html = str_replace('addtoany_share_save" href="https://www.addtoany.com/share#url='.$https_url_encoded, 'addtoany_share_save" href="https://www.addtoany.com/share#url='.$http_url_encoded, $html);
return $html;
}
add_filter("rsssl_fixer_output","rsssl_exclude_http_url");