Input manager or Transform.'direction' issue

I have a weird issue with the code below where movement on the z “vertical” axis does not occur.
the Debug logs show me that the input manager is working perfectly. the vertical inputs produce either -1 or +1 but the object only responds to the horizontal inputs.
If i comment out the xPlayerMove(); in update function then verticle movement on zPlayerMove(); works just fine. Any Ideas? Also, please see my input manager at the bottom. Cheers.

public class ExampleCode: MonoBehaviour
{
    [Tooltip("In ms^-1, total normal spped")] [SerializeField] float normalPanSpeed = 20f;
    [Tooltip("In ms^-1, total boosted speed")] [SerializeField] float boostPanSpeed = 40f;

    float panSpeed;
    float xThrow, zThrow;
    Rigidbody rb;

    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetButton("Boost Pan Speed"))
        {
            panSpeed = boostPanSpeed;
        }
        else
        {
            panSpeed = normalPanSpeed;
        }

        zPlayerMove();
        xPlayerMove();
    }

    private void zPlayerMove()
    {
        zThrow = Input.GetAxis("Vertical");
        Debug.Log(zThrow);
        rb.velocity = transform.forward * (zThrow * panSpeed);
    }
 
    private void xPlayerMove()
    {
        xThrow = Input.GetAxis("Horizontal");
        Debug.Log(xThrow);
        rb.velocity = transform.right * (xThrow * panSpeed);
    }


}

Ok, so i discovered that if i swap the playerMove calls round then the the vert works and horz stops working. I added an if statement ensuring one function would stop if the other needed to work.
Movement now works as desired.

 void Update()
    {
        if (Input.GetButton("Boost Pan Speed"))
        {
            panSpeed = boostPanSpeed;
        }
        else
        {
            panSpeed = normalPanSpeed;
        }

        if (Input.GetButton("Horizontal"))
        {
            xPlayerMove();
        }
        else
        zPlayerMove();

    }