CASPERJS why executing same code makes different rezults

I have method which I use for testing in my web app. When I call it once everything works just fine. but if call it several times it not fulfills data.

method:

function createEmailAlert(alertName) {

    casper.waitForSelector('a[data-id="create-alert-button"]',
        function success() {
            casper.click('a[data-id="create-alert-button"]');
        });

    casper.wait(2000, function () {
        casper.click('div[data-id="field-alert-meta"] input[role="combobox"]');
        casper.then(function () {
            casper.clickLabel('Email', 'li');
        });
    });

    casper.then(function () {
        casper.sendKeys('div[data-id="field-alert-name"] input[type="text"]', alertName, {
            reset: true
        });
        casper.sendKeys('div[data-id="field-parameter-to"] input[role="textbox"]', 'autotest@asset-control.com');
        casper.sendKeys('div[data-id="field-parameter-cc"] input[role="textbox"]', 'autotest.cc@asset-control.com');
        casper.sendKeys('div[data-id="field-parameter-bcc"] input[role="textbox"]', 'autotest.bcc@asset-control.com');
        casper.sendKeys('div[data-id="field-parameter-subject"] input[role="textbox"]', 'Email Alert Text');
        casper.sendKeys('div[data-id="field-parameter-text"] textarea[role="textbox"]', 'Email alert comments....');
    });
};

call:

casper.test.begin('Test double click activity assigned alert', function suite(test) {

 createEmailAlert('BLUE ALERT');

    casper.run(function () {
        test.done();
    });

works well, but if write:

    casper.test.begin('Test double click activity assigned alert', function suite(test) {

     createEmailAlert('BLUE ALERT1');
     createEmailAlert('BLUE ALERT2');

        casper.run(function () {
            test.done();
        });

creates two objects, but data is filled randomly, and not all. Why?