RandomStringUtils - Not generating unique String for each test scenario

I am running a Selenium test and I'm trying to generate a different random String for each of my test scenarios, but I keep getting the same String.

Here is an example of what I'm running:

String randomString = RandomStringUtils.randomAlphabetic(8);

@Test(priority = 1)
private void testScenario_1(){
    System.out.println(randomString);
}

@Test(priority = 2)
private void testScenario_2(){
    System.out.println(randomString);
}