Calculated items that contain other calculated items arguments don't always always use the last argument's calculated value.

See below example, the calculated rate:
2014.Aug.11 13:38:23 125
uses the "Calculated Argument2" value:
2014.Aug.11 13:23:22 4
instead of:
2014.Aug.11 13:38:22 9
which was updated just one second before the rate calculation.

Queried values:
Calculated rate (formula is 100*last("Argument1")/last("Calculated Argument2"):
2014.Aug.11 13:53:23 44.4444
2014.Aug.11 13:38:23 125
2014.Aug.11 13:23:23 22.2222

Argument1:
2014.Aug.11 13:50:28 4
2014.Aug.11 13:35:29 5
2014.Aug.11 13:20:28 2

Calculated Argument2:
2014.Aug.11 13:53:22 7
2014.Aug.11 13:38:22 9
2014.Aug.11 13:23:22 4