Strange rotation pattern.

So I'm making a motorcycle game and when you turn I want the bike to lean but freaks out whenever you turn. I have this in my Update method:

     var md = new Vector2(Input.GetAxisRaw("Mouse X"), Input.GetAxisRaw("Mouse X"));
     md = Vector2.Scale(md, new Vector2(sensitivity * smoothness, sensitivity * smoothness));
     smoothV.x = Mathf.Lerp(smoothV.x, md.x, 1f / smoothness);
     smoothV.y = Mathf.Lerp(smoothV.y, md.y, 1f / smoothness);

     mouseLook += smoothV;
     mouseLook.x = Mathf.Clamp(mouseLook.x, -45, 45);
     transform.rotation = Quaternion.AngleAxis(-mouseLook.x, transform.forward);
     transform.Rotate(Vector3.up, transform.rotation.z * Time.deltaTime * 7500);
     
     transform.Translate(0, 0, 1 * speed * Time.deltaTime);

I know some of that is unnecessary, I modified an earlier script instead of making a new one.