Zabbix cpu usage not reporting correctly

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http://stackoverflow.com – I'm pretty sure it is a config error somewhere but I can't figure it out. The cpu screen for the machine I'm monitoring shows CPU system time of about 4-5% and cpu nice time of about 20%. Top is showing that the cpu% for the machine I'm monitoring is 39-40%. Why would Zabbix not display the result correctly? I'm not very familiar with zabbix, But I know I have seen it display correct stats for a machine before.. (HowTos)