Cron firing my function everytime wp-admin is visited

This is a MU-plugin I’m developing, and I want it to run hourly. Unfortunately, it’s running every time I visit any site’s wp-admin page. I’ve used the Debug Bar plugin with the Cron plugin, and it consistently says that the next event is in the past. Any ideas?

add_action('admin_menu', 'dhg_cron_menu');
function dhg_cron_menu()
{
    add_options_page('NEW WPMS Stats', 'NEW WPMS Stats', 'manage-options', 'dhg-cron', 'dhg_cron_settings');
}

function dhg_cron_settings()
{
    if(!wp_next_scheduled('dhg_cron_hook'))
    {
        wp_schedule_event(time(), 'hourly', 'dhg_cron_hook');
    }
}

add_action('dhg_cron_hook', 'dhg_cron_get_stats');
function dhg_cron_get_stats()
{
    //  this is a custom function I use to log to a file for testing...
    log_wpms_stats("testing!");
}