Duplicate mail notifications are generating in AD driver

Mail notification is triggering twice from AD driver.Could not find any issues with code. Mail notifications are working fine with rest of the drivers. Any idea what would be the issue.

<nds dtdversion="2.2">
<source>
<product build="20170106_120000" instance="\BBCIDV\system\driverset1\AD-Internal-BBC" version="4.0.2.1">AD</product>
<contact>NetIQ Corporation</contact>
</source>
<input>
<modify class-name="group" event-id="0" src-dn="CN=ACL_BLR11_Forbrugsopkrævning - Vejle_RWM,OU=Grupper,DC=idmdev,DC=BBC,DC=COM">
<association>f3f56eb55082cf43ac0b60dd53100e91</association>
<modify-attr attr-name="member">
<add-value>
<value association-ref="af0e13280ed3ff488b88fd5b497248e7" naming="false" type="dn">CN=BALAKRISHNAN\,ROHITH YRQ,CN=Users,DC=idmdev,DC=BBC,DC=COM</value>
</add-value>
</modify-attr>
</modify>
</input>
</nds>
[09/27/19 09:19:53.261]:InternalAD PT:Applying policy: % CCWatchdog-AD%-C.
[09/27/19 09:19:53.261]:InternalAD PT: Applying to modify #1.
[09/27/19 09:19:53.261]:InternalAD PT: Evaluating selection criteria for rule 'Watchdog - group creation'.
[09/27/19 09:19:53.261]:InternalAD PT: (if-class-name equal "Group") = TRUE.
[09/27/19 09:19:53.261]:InternalAD PT: (if-operation equal "add") = FALSE.
[09/27/19 09:19:53.261]:InternalAD PT: Rule rejected.
[09/27/19 09:19:53.261]:InternalAD PT: Evaluating selection criteria for rule 'Watchdog - group member update'.
[09/27/19 09:19:53.261]:InternalAD PT: (if-class-name equal "Group") = TRUE.
[09/27/19 09:19:53.261]:InternalAD PT: (if-operation equal "modify") = TRUE.
[09/27/19 09:19:53.261]:InternalAD PT: (if-op-attr 'Member' available) = TRUE.
[09/27/19 09:19:53.261]:InternalAD PT: Rule selected.
[09/27/19 09:19:53.261]:InternalAD PT: Applying rule 'Watchdog - group member update'.
[09/27/19 09:19:53.261]:InternalAD PT: Action: do-send-email-from-template(notification-dn="Security\Default Notification Collection",template-dn="Security\Default Notification Collection\WatchDogGroupModificationNotification","test","test","zrm@BBC.COM","zhr@BBC.COM","xsq@BBC.COM").
[09/27/19 09:19:53.261]:InternalAD PT: Groupname("test")
[09/27/19 09:19:53.261]:InternalAD PT: token-text("test")
[09/27/19 09:19:53.261]:InternalAD PT: Arg Value: "test".
[09/27/19 09:19:53.261]:InternalAD PT: Member("test")
[09/27/19 09:19:53.261]:InternalAD PT: token-text("test")
[09/27/19 09:19:53.261]:InternalAD PT: Arg Value: "test".
[09/27/19 09:19:53.261]:InternalAD PT: to("zbc@BBC.COM")
[09/27/19 09:19:53.261]:InternalAD PT: token-text("zbc@BBC.COM")
[09/27/19 09:19:53.261]:InternalAD PT: Arg Value: "zbc@BBC.COM".
[09/27/19 09:19:53.261]:InternalAD PT: cc("zcc@BBC.COM")
[09/27/19 09:19:53.261]:InternalAD PT: token-text("zcc@BBC.COM")
[09/27/19 09:19:53.261]:InternalAD PT: Arg Value: "zcc@BBC.COM".
[09/27/19 09:19:53.261]:InternalAD PT: cc("xxy@BBC.COM")
[09/27/19 09:19:53.261]:InternalAD PT: token-text("xxy@BBC.COM")
[09/27/19 09:19:53.261]:InternalAD PT: Arg Value: "xxy@BBC.COM".
[09/27/19 09:19:53.277]:InternalAD PT: Action: do-veto().
[09/27/19 09:19:53.277]:InternalAD PT:Policy returned:
[09/27/19 09:19:53.277]:InternalAD PT: