Editing ItemStacks in lists not working?

I'm editing ItemStacks in a list, but when I change the displayname it isn't updating in the player inventory. I know it should work, but it isn't for me :I Check out my code:

Code:

    public void loadTimer() {
       
        Bukkit.getScheduler().scheduleSyncRepeatingTask(plugin, new Runnable() {
            public void run() {
                for(ItemStack i : loads) {
                                       
                    ItemMeta im = i.getItemMeta();
                               
                    int theirtime;
                   
                    if(loadtime.containsKey(i)) {
                        theirtime = loadtime.get(i);
                    } else {
                        theirtime = 3;
                    }
   
                    Bukkit.broadcastMessage(theirtime + "");
                   
                    if(theirtime == 0) {
                               
                        im.setDisplayName(ChatColor.WHITE + "Musket - " + ChatColor.GRAY + "Loaded"); // <----- Change name
                        i.setItemMeta(im); // "i" is an Item in the list
                                               
                        loadtime.remove(i);
                        loads.remove(i);
                       
                        Bukkit.broadcastMessage(im.getDisplayName() + ", name");

                        return;
                       
                    }
                                       
                    loadtime.put(i, theirtime - 1);
                    return;
                   
                }
            }
        }, 0L, 20L);

    }

The plugin doesn't throw any errors also

 

Try updating their inventory: player.getPlayer().updateInventory();