Java JUnit, result not changing when updated

I am currently writing some unit test for my Java 8 code. And I have a problem.

In the code below, you can see 3 test functions the first one returns 6 which is correct. However, the second one does also return 6 even though it should return 16, and the third also return 6 even though it should return 21.

And if I comment out the first function the second returns 16 which is correct. But now the third function is returning 16 instead of 6, where it should return 21.

The code I am testing is a Static Class.

@Test
public void testRun1() {
    Integer[][] input = {
        {6},
        {6, 6},
        {5, 6},
        {4, 6},
        {3, 6},
        {2, 6},
        {1, 6},
    };
    int expResult = 6;
    int result = BoardingTest.Run(input);
    assertEquals(expResult, result);
}

@Test
public void testRun2() {     
    Integer[][] input = new Integer[][]{
        {6},
        {6, 6},
        {6, 4},
        {5, 6},
        {3, 8},
        {1, 9},
        {2, 1},
    };
    int expResult = 16;
    int result = instance.Run(input);
    assertEquals(expResult, result);
}

@Test
public void testRun3() {
    Integer[][] input = new Integer[][]{
        {6},
        {1, 1},
        {2, 2},
        {3, 3},
        {4, 4},
        {5, 5},
        {6, 6},
    };
    int expResult = 21;
    int result = BoardingTest.Run(input);
    assertEquals(expResult, result);
}