Credit note doubling

Hi Oracle Team,

In my store when I am doing billing credit note value doubling in Xcenter not in Store.
For credit note 
<PersistenceManagerType name="VOUCHERS" ref="XCENTER_STANDARD" />

we provided and for XCENTER_STANDARD 

<PersistenceManagerType name="XCENTER_STANDARD" ref="STORE_STANDARD">

    <Online dtype="LocationGroup">

      <LookupLocation dataSourceName="Xcenter" />

      <LookupLocation dataSourceName="StorePrimary" />

      <PersistenceLocation dataSourceName="StorePrimary" />

    </Online>

This setting present.
When ever I do CN issue transaction my amount got double in Xcenter and store it is same so can I know any reason why it is happening.

For store standard setting we have sync="true" present like this 

<PersistenceManagerType name="STORE_STANDARD" sync="true">