Character controller code acting differently on android to PC

I have been creating a platformer game meant for android for a few days now, due to the fact that I haven't been able to get android remote to work I have been testing on my PC (the game potentially uses on-screen buttons).

Here is my code for player movement:

 using UnityEngine;
 using System.Collections;
 
 public class playerMovement1 : MonoBehaviour {
     
     
     Rect leftButton = new Rect(0, Screen.height-(Screen.height/3), Screen.width/4, Screen.height/3);
     Rect rightButton = new Rect(Screen.width/4, Screen.height-(Screen.height/3), Screen.width/4, Screen.height/3);
     Rect jumpButton = new Rect(3*(Screen.width/4), Screen.height-(Screen.height/3), Screen.width/4, Screen.height/3);
     public float speed;
     float xV;
     float yV;
     float jumpTimeCount = 0;
     public float jumpSpeed;
     bool left;
     bool right;
     bool jump;
     bool jumping;
     bool canJump;
     public bool androidBuild;
     public bool gravity;
     public float gravityForce;
        
     // Use this for initialization
     void Start () {
     
     }
     
     void FixedUpdate(){
     
     }
     
     
     
     void Update () {
         if(jumping){
             print ("jumping");
                 jumpTimeCount += 1*Time.deltaTime;
             if(jumpTimeCount>0.8){
                 //Jumping slows as it reaches peak
                 yV = jumpSpeed*0.8f;    
             }
             //Upward movement ends when jumpTimCounter is above 1
             if(jumpTimeCount>1){
                 canJump = false;
                 jumpTimeCount = 0;
                 jumping = false;
             }
         }
         
         
     
         input ();
         tick ();
         CharacterController controller = GetComponent<CharacterController>();
         if(controller.isGrounded){
             print ("grounded");
             jumping = false;
             canJump = true;    
         }else{
                 
         }
         
         if (controller.collisionFlags == CollisionFlags.Sides){
             //Basic wall jump code
             print ("touching sides");
             canJump = true;    
         }
         if(gravity){
             controller.Move(new Vector3(0,gravityForce*Time.deltaTime,0));
         }
         
         //All movement performed here
         controller.Move(new Vector3(xV*Time.deltaTime,yV*Time.deltaTime,0));
         
     }
     
     
     void tick(){
         if(left){
             xV = -speed;
         }
         
         if(right){
             xV = speed;
         }
         
         if(!right && !left){
             xV = 0;    
         }
         
         if(jump){
             if(canJump){
                 jumping = true;
                 yV = jumpSpeed;
             
             }
         }else{
             jumping = false;    
         }
         
         if(!jumping){
             yV = 0;    
         }
     
     }
     
     void input(){
         
     
         if(Input.touches.Length>0){
     
                 
             for(int i = 0; i<Input.touchCount; i++){
             
             
                 if(jumpButton.Contains(new Vector2(Input.GetTouch(i).position.x, Screen.height-Input.GetTouch(i).position.y))){
                     jump = true;
                 }else{
                     jump = false;    
                 }
                 
         
                 if(leftButton.Contains(new Vector2(Input.GetTouch(i).position.x, Screen.height-Input.GetTouch(i).position.y))){
                     left = true;
                 }else{
                     left = false;    
                 }
                 
                 if(rightButton.Contains(new Vector2(Input.GetTouch(i).position.x, Screen.height-Input.GetTouch(i).position.y))){
                     right = true;
                 }else{
                     right = false;    
                 }
             
                 
             }
             
         }
         
         if(!androidBuild){
             if(Input.GetKey(KeyCode.A)){
                 
                 left = true;    
             }else{
                 left = false;    
             }
             if(Input.GetKey(KeyCode.D)){
                 right = true;    
             }else{
                 right = false;    
             }
             if(Input.GetKey(KeyCode.Space)){
                 jump = true;    
             }else{
                 jump = false;    
             }
         }
     }
 }

When building for android I set androidBuild to true to ensure the Keyboard input code does not interfere. When I run the game on my phone the movement seems to work differently, you don't stop when releasing the left or right button and jumping stops all other movement. Is this a problem with my code? or is this usual for android builds, and how would I go about fixing it?

Thanks