Problem with touch button on android platformer game.

Hello everyone, iam creating platformer game which has 3 button. one button to move left, one button to move right and one button to move right.

Here is my sample code for moveScript and JumpScript.

 using UnityEngine;
 using System.Collections;
 
 public class JumpAlma : MonoBehaviour {
     public bool jump = false;
     public float jumpForce = 450;
     public GameObject alma;
     public Transform groundCheck;
     private bool grounded = false;
     public bool player1 = true;
     public AudioClip audio ;
     public Animator animator;
 
 
 
     void Awake () {
     
         groundCheck = alma.gameObject.transform.Find("groundCheck");
     
     
     }
 
     void Update () {
     grounded = Physics2D.Linecast(alma.gameObject.transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));
 
 
     
 
         if (jump && grounded) {
 
         //    animator.SetBool("Jump",true);
             AudioSource.PlayClipAtPoint(audio,transform.position);
         
             alma.gameObject.rigidbody2D.AddForce (new Vector2 (0f, jumpForce));
 
 
             StartCoroutine(delayJump());
             jump = false;    
             
         }
 
 
     
         
 
     }
 
     IEnumerator delayJump(){
         yield return new WaitForSeconds (0.8f);
     //    animator.SetBool ("Jump", false);
         }
 
 
 
 void OnMouseDown(){
 
         gameObject.transform.localScale = new Vector3(0.8f, 0.8f, 0);
         }
 
 
     void OnMouseUp() {
         Debug.Log (grounded);
         gameObject.transform.localScale = new Vector3(1f, 1f, 0);
         jump = true;
 
 
     }
 }
 




 using UnityEngine;
 using System.Collections;
 
 public class Walk : MonoBehaviour {
 
     public GameObject alma;
     public Transform groundCheck;
     private bool grounded = false;
     public bool player1 = true;
     public AudioClip audio ;
     public Animator animator;
     public bool left;
     public float movementSpeed;
 
 
 
     void Awake () {
     groundCheck = alma.gameObject.transform.Find("groundCheck");
     
     }
 
     void Update () {
     grounded = Physics2D.Linecast(alma.gameObject.transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));
         }
 
 
     
 
 
 
 void OnMouseDrag(){
         if (left) {
                         movementSpeed = -3f;
                 }
         else {
             movementSpeed = 3f;
                 }
 
 
         if(grounded){
 
         alma.gameObject.rigidbody2D.velocity = new Vector3 (movementSpeed, 0, 0);        
         }    
         gameObject.transform.localScale = new Vector3(0.8f, 0.8f, 0);
         }
 
 
 void OnMouseUp() {
         gameObject.transform.localScale = new Vector3(1f, 1f, 0);
     
 
     }
 }
 

Move Button work well , Jump Button too.. The problem is when i hold move button then i press jump button it wont jump.

anyone can help me :) , thx before