Multiple button draws

With some help from on here i've managed to get a button to draw a box, originally, prior to this coding it was drawing all buttons, but now it's only drawing one? Any ideas as to why? ( when I click the only drawn button, the box and the other required buttons appear too)

 using UnityEngine;
 using System.Collections;
  
 public class Gui : MonoBehaviour {
     bool boxcheck1 = false;
     bool boxcheck2 = false;
     bool boxcheck3 = false;
     bool boxcheck4 = false;
     bool shutboxcheck1 = false;
     
  //Campaign box
     void OnGUI() {
     if (GUI.Button(new Rect(250, 700, 90, 20), "Campaign")){
         boxcheck1 = true;
     }
     if (boxcheck1 == true) {
             boxcheck2 = false;
             boxcheck3 = false;
             boxcheck4 = false;
       GUI.Box(new Rect(10, 10, 1008, 680), "");
             if (GUI.Button(new Rect(550, 700, 90, 20), "Close window")){
             shutboxcheck1 = true;
      }
         if (shutboxcheck1 == true) {
             boxcheck1 = false;
             boxcheck2 = false;
             boxcheck3 = false;
             boxcheck4 = false;
             }
         
 //Skirmish box
   
     if (GUI.Button(new Rect(350, 700, 90, 20), "Skirmish")){
               boxcheck2 = true;
     }
     if (boxcheck2 == true) {
             boxcheck1 = false;
             boxcheck3 = false;
             boxcheck4 = false;
       GUI.Box(new Rect(10, 10, 1008, 680), "");
      }
         
 //Online box
         if (GUI.Button(new Rect(450, 700, 90, 20), "Online")){
                     boxcheck3 = true;
     }
     if (boxcheck3 == true) {
             boxcheck1 = false;
             boxcheck2 = false;
             boxcheck4 = false;
       GUI.Box(new Rect(10, 10, 1008, 680), "");
      }
         
 //Options box
         if (GUI.Button(new Rect(550, 700, 90, 20), "Options")){
                     boxcheck4 = true;
     }
     if (boxcheck4 == true) {
             boxcheck1 = false;
             boxcheck3 = false;
             boxcheck2 = false;
       GUI.Box(new Rect(10, 10, 1008, 680), "");
      }
         
 //Quit command
         if (GUI.Button(new Rect(650, 700, 90, 20), "Exit Trinity"))
             Application.Quit();
         
         
     }
 }
 }