Input.GetButtonDown("Fire1") not working while 'moving'

Hi everyone,

I'm trying to destroy a cube by using a raycast to hit it every time i press the left mouse button. While standing perfectly still, this seems to work flawlessly. However, once my character is moving - even if just falling - the GetButtonDown command doesn't seem to register.

Code Below

 void Update()
 {
     
     if (Input.GetButtonDown("Fire1"))
     {
         Debug.DrawRay(transform.position, transform.forward * 1000f, Color.green, 1000f);
         shooting = true;
     }
 }
 void FixedUpdate()
   {
     if (shooting)
     {
         RaycastHit hit;
         if (Physics.Raycast(transform.position, transform.forward, out hit, 1000f))
         {
             if (hit.transform.tag == "Killable")
             {
                 hit.collider.SendMessage("Hurt", damage, SendMessageOptions.DontRequireReceiver);
                 GameObject bloodcopy;
                 Blood.transform.position = hit.point;
                 bloodcopy = Instantiate(Blood, hit.point, Quaternion.identity);
                 GameObject.Destroy(bloodcopy, .3f);
             }
         }
         shooting = false;

     }
 }

At first i thought it had something to do with the raycast itself while i was moving, I turned on drawing of the cast to help see what was happening, but couldn't see it. I then moved the draw to where it is above, and discovered that it would never draw while moving, but always draw when not moving.

What is going on?