It's not a problem, it's by design: From rhq-plugin.xsd:
<xs:attribute name="measurementType" default="dynamic">
If dataType is "measurement", this further describes the measurement data.
This defines whether the measurement values that get collected
consistently increase over time or are dynamic and can "randomly"
be higher or lower than previous values. The system will by itself generate
per minute metrics for data with measurementType of
trendsup or trendsdown.
RHQ is helping you underdstand the rate of change for metrics that increase or decrease. It's the per-minute value that is often useful for alerting, for example.
Thanks for clarifying my doubt... Thanks a lot.