Count Variable Acting Strange

CODE:

 public void InventoryWindow(int id){
         int cnt = 0;
         string itemToolTip;                        
         for(int y = 0; y < _inventoryRows; y++){
             for(int x = 0; x < _inventoryCols; x++){
                 if(cnt < inv.Stacks.Count && inv.Stacks[cnt] != null){
                     if(!editing){
                         itemToolTip =  "<b>" + inv.Stacks[cnt].Item.Name + "</b> \n " + inv.Stacks[cnt].Item.Description + " \n <size=10>" + inv.Stacks[cnt].Item.Type + "</size>";
                     } else{itemToolTip = "";}
                     if(GUI.Button(new Rect(5 + (x * buttonWidth), 20 + (y * buttonHeight), buttonWidth, buttonHeight), new GUIContent(inv.Stacks[cnt].Item.Icon, itemToolTip), "box")){
                         editing = true;
                     }
                     if(editing){
                         GUI.BeginGroup(new Rect(32.5f, 280, 200, 90), comboBacker);
                         for(int i = 0 ; i < items.Length; i++){
                             int index = cnt;
                             print(cnt + " = Index!");//Normal here********
                             if(GUI.Button(new Rect(0, (30 * i), 200, 30), items[i], "button")){
                                 print(cnt + " = COUNT!!!!");//Always Zero here********
                                 selectedItem = items[i];
                                 editing = false;
                                 switch(selectedItem){
                                 case "Use":
                                     //print ("Use Item");//Use Item
                                     UseItem(inv.Stacks[index].Item);
                                     break;
                                 case "Drop":
                                     //print ("Drop Item");//Drop Item
                                     break;
                                 case "Cancel":
                                     //Do nothing, just close options
                                     break;
                                 default:
                                     //Do nothing, just close options
                                     break;
                                 }
                             }
                         }
                         GUI.EndGroup();
                     }
                     
                     GUI.Label(new Rect(6 + (x * buttonWidth), 20 + (y * buttonHeight), 50, 50), inv.Stacks[cnt].Size.ToString(), "label");
                     //print (inv.Stacks[cnt].Item.Name);
 
                 } else if(inv.Stacks[cnt] == null){
                     GUI.Button(new Rect(5 + (x * buttonWidth), 20 + (y * buttonHeight), buttonWidth, buttonHeight), (x + y * _inventoryCols).ToString(), "box");
                 }
                 //print(cnt);
                 cnt++;
             }
         }
         Tooltip.Instance.TooltipGUI();
         GUI.DragWindow();
     }

For some reason when i try to reference the 'cnt' variable at the switch statement it always equals ZERO?

About 4/5 lines from bottom i have a print which is working fine and the 'cnt' variales is working, but why not for the switch statement?

EDIT:

The 'cnt' variable stops working after line 18, but works fine before it. *Added Whole Function