Item "Length of the run queue" is wrong.
It is not included in "Performance" application (like the rest of the CPU items),
and "Type of information" shouldn't be "Numeric (unsigned)",
but "Numeric (float)".
Just as specified by the documentation: https://www.zabbix.com/documentation/2.4/manual/config/items/itemtypes/zabbix_agent (system.stat[resource,<type>])