Save post action is called twice

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I noticed there was a 302 redirect in my network tab while saving. Save_post was being triggered twice, once from

Inside my call, I simply included:

$referrer = wp_get_referer();

if (strpos($referrer, 'http:') !== false) {
    error_log("not the right referrer, aborting");
    return;
}

Issue solved.