Hi buchaviso,
another user (@sabinerocktimes) reported the same error in this thread, but we couldn’t reproduce the error: entries really were saved in the database incorrectly, you may check whether this also holds for your case. She solved the problem with an update to the latest WordPress version.
Note that your WP version 4.4.1 is quite old (and even not the latest one of the 4.4 series).
I reproduced the error with WordPRess 4.4.x. Statify 1.5.1 is compatible with WordPress 4.7+ due to use of the 2nd parameter in wp_parse_url introduced in WP 4.7. In WP 4.4 the second parameter for wp_parse_url is not supported and the function returns an array – that’s why $data[‘target’] is set to ‘Array’ in statify_frontend.class.php::75.
Updating WordPress to 4.7+ should fix the problem.