Problem with getkeyup,GetKeyUp doesnt work sometimes

So when pressing one key, lets say "A", then pressing another one, lets say "D" and keeping "A" pressed, when i then release "D", getkeyup for that doesnt get fired, i need help

 void Update()
     {
 
         if (Input.GetKeyUp(KeyCode.W) && moveDirection.z != 0) {
                 stopw = true;
             }
             if (Input.GetKeyUp(KeyCode.S) && moveDirection.z != 0) {
                 stops = true;
             }
             if (Input.GetKeyUp(KeyCode.A) && moveDirection.x != 0) {
                 stopa = true;
             }
             if (Input.GetKeyUp(KeyCode.D) && moveDirection.x != 0) {
                 Debug.Log("d up");
                 stopd = true;
             }
         
         if (c.isGrounded)
         {
             if (stopw) {
                 moveDirection -= transform.forward * speed;
                 stopw = false;
             }
             if (stops) {
                 moveDirection += transform.forward * speed;
                 stops = false;
             }
             if (stopa) {
                 moveDirection += transform.right * speed;
                 stopa = false;
             }
             if (stopd) {
                 moveDirection -= transform.right * speed;
                 stopd = false;
             }
             // We are grounded, so recalculate
             // move direction directly from axes
 
             if (Input.GetKeyDown(KeyCode.W)) {
                 moveDirection += transform.forward * speed;
             }
             if (Input.GetKeyDown(KeyCode.S)) {
                 moveDirection -= transform.forward * speed;
             }
             if (Input.GetKeyDown(KeyCode.A)) {
                 moveDirection -= transform.right * speed;
                 Debug.Log("a down");
             }
             if (Input.GetKeyDown(KeyCode.D)) {
                 moveDirection += transform.right * speed;
                 Debug.Log("d down");
             }

,i know there are lot of questions about getkeyup, but i havent seen mz problem anywhere. So when i press one key, lets say a, then press another, lets say b, and then release b, getkeyup for b doesnt get fired.`void Update() {

     if (Input.GetKeyUp(KeyCode.W) && moveDirection.z != 0) {
             stopw = true;
         }
         if (Input.GetKeyUp(KeyCode.S) && moveDirection.z != 0) {
             stops = true;
         }
         if (Input.GetKeyUp(KeyCode.A) && moveDirection.x != 0) {
             stopa = true;
         }
         if (Input.GetKeyUp(KeyCode.D) && moveDirection.x != 0) {
             Debug.Log("d up");
             stopd = true;
         }
     
     if (c.isGrounded)
     {
         if (stopw) {
             moveDirection -= transform.forward * speed;
             stopw = false;
         }
         if (stops) {
             moveDirection += transform.forward * speed;
             stops = false;
         }
         if (stopa) {
             moveDirection += transform.right * speed;
             stopa = false;
         }
         if (stopd) {
             moveDirection -= transform.right * speed;
             stopd = false;
         }
         // We are grounded, so recalculate
         // move direction directly from axes

         if (Input.GetKeyDown(KeyCode.W)) {
             moveDirection += transform.forward * speed;
         }
         if (Input.GetKeyDown(KeyCode.S)) {
             moveDirection -= transform.forward * speed;
         }
         if (Input.GetKeyDown(KeyCode.A)) {
             moveDirection -= transform.right * speed;
             Debug.Log("a down");
         }
         if (Input.GetKeyDown(KeyCode.D)) {
             moveDirection += transform.right * speed;
             Debug.Log("d down");
         }`