InventoryClickEvent - Cancelling problem

Hey,

I've got a quick question. I'm using an InventoryClickEvent where I check if a the material clicked is equal to the one allowed, that all works. However if I cancel the event when it isn't some strange things happen.

For some reason when the event is cancelled the required item (if in inv) appears on my cursor, also when I close my inventory the required item pops out of my inventory.

Here's the code I'm using:

Code:

    @EventHandler
    public void InvClickEvent(InventoryClickEvent event){
       
        if(event.getView().getType() == InventoryType.CHEST){
            String title = event.getInventory().getTitle();   
           
 
            List<String> FInputMaterials = Main.FInputMaterials;
            List<String> FOutputMaterials = Main.FOutputMaterials;
            List<String> ICustomItemNames = Main.ICustomItemNames;
            List<String> OCustomItemNames = Main.OCustomItemNames;
            List<String> Buildings = Main.Buildings;
           
            if(title.contains("Storage")){
               
            }
               
            if(title.contains("Input")){
            String Buildingname = title.replace(" Input:","");
 
           
            if(Buildings.contains(Buildingname)){
               
            int pos = Buildings.indexOf(Buildingname);
            final String[] InputMatsplt = FInputMaterials.get(pos).split(",");
            final String[] Icustomitemsplt = ICustomItemNames.get(pos).split(",");
           
            int min = 1;
           
            if(InputMatsplt.length == 1){
            min--;   
            }
           
            for(int i=0;i<=(Math.floor(InputMatsplt.length/2)-min);i++){
           
            Material mat = Material.getMaterial(InputMatsplt[i]);
            String custom_name = Icustomitemsplt[i];
         
                if(event.getCurrentItem().getType() == mat){
                   
                  if(!custom_name.equalsIgnoreCase("nothing")){
                  if(event.getCurrentItem().getItemMeta().getDisplayName() != null){
                  if(!custom_name.equalsIgnoreCase(event.getCursor().getItemMeta().getDisplayName())){
                    event.setCancelled(true);   
                  }
                  return;
                  }
                  else{
                      event.setCancelled(true);   
                    return; 
                  }
                }
                }
                else{
                    event.setCancelled(true);   
                    return;
                }
           
            }   
            }
            }
-snip-

 

JeroenV besides cancelling, use event.setResult(Event.Result.DENY);