group alerts if there are 3 alerts if not dont group them

[AnimeshP_96]

requirement is if 3 alerts is created in servicenow , group them which is working but now what is happening is 3 alerts are created but this rule is not matching and showing some different rule in activites under work notes ,some other rule is taking precendence. ..so now if 4 alerts re created it should not group it 

(function findCorrelatedAlerts(currentAlert) {

    var result = {};

    var table = "em_alert";

    //var cnt;

    var storeID = [];

    //var childalerts = [];

    var parent = [];

    var alertGr = new GlideRecord(table);

    alertGr.addNullQuery("parent");

    alertGr.orderBy("sys_created_on");

    alertGr.setLimit(3);

    alertGr.query();

    while (alertGr.next()) {

        gs.info("this is li3ne 13 from me");

        storeID.push(alertGr.getUniqueValue());

    }

    if (storeID.length === 3) {

        gs.info("this is2222229833 ");

        parent = currentAlert.sys_id;

    }

    gs.info("this is2379863 " + parent);

    result = {

        'parent': [String(currentAlert.sys_id)]

    };

    return JSON.stringify(result);

})(currentAlert);

pls can someone help me where i am going wrong..

in the below picture it is creating a new alert instead of making 607 as parent which is expected

[Ankur Bawiskar]

@AnimeshP_96 

sorry I didn't get the time

Also I don't have event management installed on my PDI

[AnimeshP_96]

grouping is happening but manual, if you see group column, it should be tag cluster, but its not working using script logic. @TejasSN_LogicX @Ankur Bawiskar  let me know if any luck 
also m using alert corealtion rule  table =em_alert