why in this part step is 0 all the time? in this part:

step = movingToRadiusSpeed * Time.deltaTime;
transform.position = Vector3.MoveTowards(transform.position,
radiusPosition, step); 

if Time.deltaTime is changing all the time why step is 0 all the time? i used a break point and step is 0 all the time.

and i checked the variable movingToRadiusSpeed is declared once in the top without being initialized to 0 and is used once only in this part of code.

private void Update()
{
    if (target != null)
    {
        if (dc != null)
        {
            radiusPosition = new Vector3(target.position.x,
                target.position.y + dc.yRadius, target.position.z + dc.xRadius);

            radius = dc.xRadius;
        }
        else
        {
            radiusPosition = new Vector3(target.position.x, target.position.y, target.position.z + radius);
        }
    }

    if (moveToRadius == false)
    {
        if (target != null)
        {
            transform.RotateAround(target.position, axis, rotatingSpeed * Time.deltaTime);
        }

        if (randomHeight)
        {
            t += Time.deltaTime;

            if (t > delay)
            {
                prevHeight = setRandomHeight;
                setRandomHeight = Random.Range(lowerLimit, upperLimit);
                t = 0;
            }

            var tt = transform.position;
            tt.y = Mathf.Lerp(prevHeight, setRandomHeight, t);
            transform.position = tt;
        }
    }

    if (dc != null)
    {
        if (lastRadius != dc.xRadius)
        {
            moveToRadius = true;

            lastRadius = dc.xRadius;
        }
    }
    else
    {
        if (lastRadius != radius)
        {
            moveToRadius = true;

            lastRadius = radius;
        }
    }

    if (moveToRadius)
    {
        if (transform.position != radiusPosition)
        {
            float step = movingToRadiusSpeed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position,
                radiusPosition, step);
        }
        else
        {
            moveToRadius = false;
        }
    }
}