Spike Arrest Policy allowing more transactions then configured

I have configured spike arrest policy in API proxy deployed in Apigee Hybrid environment.

I have configured to allow only 1ps (1 request per sec) but I can see Spike arrest is not rejecting the calls even though calls are exceeding this number.

Below is the Spike Arrest policy -

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<SpikeArrest async="false" continueOnError="false" enabled="true" name="SA-SpikeArrest">
    <DisplayName>SA-SpikeArrest</DisplayName>
    <Properties/>
    <Identifier ref="client_id"/>
    <Rate ref="flow.spikearrest.limit"/>
    <UseEffectiveCount>true</UseEffectiveCount>
</SpikeArrest>

I can see these numbers exceeding in variables in trace -

allowed.count=1
used.count=3
exceed.count=2

Is there anything I am missing here?

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