Text clearing issue- game breaking

Once again, I must turn to the community for help. I am creating a text adventure, and am encountering a severe problem. Code:

  #pragma strict
     //Keywords and keyword bools.
     private var examineWords= ["examine", "Examine","examine room","Examine room","check room","Check room", "look" ,"Look","Look around","Look around","Inspect","inspect","inspect room", "Inspect room"];
     private var exitWords= ["exit","Exit","leave","Leave","Exit room","exit room","Leave room","leave room","open door","Open door"];
     private var keyWords=["get key","Get key","Pick up key", "pick up key","Grab key","grab key","Grab","grab","take key","Take key"];
     private var isExamineOnList : boolean=false;
     private var isExitOnList : boolean=false;
     private var isKeyOnList : boolean=false;
     //Text box bools.
     private var showBox1 : boolean = true;
     private var showExamine1 : boolean=false; 
     private var showBox2 : boolean=false;
     private var showExamine2 : boolean=false;
     private var showKey2 : boolean=false;
     //Misc.
     var arcadeText : GUIStyle;
     var stringToEdit : String = "";
     
     
         function OnGUI (){
         //Return functionality.
             var returnHit = (Event.current.type == EventType.KeyDown && Event.current.keyCode == KeyCode.Return);
             stringToEdit = GUI.TextField (Rect (19, 397, 600, 20), stringToEdit, 240, arcadeText);
         
              if(returnHit) {
     Return();
     
         
         }
         //Light room desc 1.
         if (showBox1 == true)
         
        {GUI.Box(Rect(0,0,Screen.width,Screen.height),"Greetings, Adventurer. You have but one goal: to return to reality.\nYou are in a low-lit stone room with a single unlocked door visible.", arcadeText);}
       //Light room desc 2.
       if (showBox2== true)
       
         {GUI.Box(Rect(0,0,Screen.width,Screen.height),"The next room you enter is an intersection, with one path branching forward and\none right, with a locked door blocking each. To the left hangs a rusted but still\nfunctional key on a chain. As soon as you enter, the door behind you slams shut,\nfusing itself to the wall. You must press on. You see footprints matching yours\non the floor. Have you done this before?", arcadeText);}
       //for statements
       for each (var word1 in examineWords){if (word1==stringToEdit){isExamineOnList=true;}
       }
       
       for each (var word2 in exitWords) {if (word2==stringToEdit){isExitOnList=true;} 
             }
       for each (var word3 in keyWords) {if (word3==stringToEdit){isKeyOnList=true;}
       }
       
         //Box 1 ifs.     
         if (isExamineOnList==true && returnHit && showBox1==true) {showBox1=false; showExamine1=true;}      
         if (showExamine1==true){GUI.Box(Rect(0,0,Screen.width,Screen.height),"Upon further inpection, the craftmanship looks ancient, with moss growing in\nsome places. Dripping water and cool air suggests a deep climate, and the light\nhas no visible source.", arcadeText); ExamineBox1();}    
         if (isExitOnList==true && returnHit && showBox1==true) {showBox1=false; BoxWait();}
         //Box 2 ifs.
         if (isExamineOnList==true && returnHit && showBox2==true) {showBox2=false; showExamine2=true;}  
         if (showExamine2==true) {GUI.Box(Rect(0,0,Screen.width,Screen.height),"This room is nearly identical to the last. The rusted key appears to be in\nworking order. There is no trace of the previous room, and the door appears as\nhard as the surrounding stone. The footprints are indeed a perfect match to\nyour own. Each corridor is locked firmly. Perhaps the key could do the trick...  ", arcadeText); ExamineBox2();}    
         if (isKeyOnList==true && returnHit && showBox2==true) {showBox2=false; showKey2=true;}
         if (showKey2==true) {GUI.Box(Rect(0,0,Screen.width,Screen.height),"Key acquired. Try using it!", arcadeText); KeyBox2();}
     }
     function Return () { stringToEdit = stringToEdit; yield WaitForEndOfFrame; stringToEdit= "";} 
     function BoxWait(){yield WaitForSeconds(1.0); showBox2=true;}
     function ExamineBox1(){
     yield WaitForSeconds(9.0); isExamineOnList=false; showExamine1=false; showBox1=true;} 
     function ExamineBox2(){
     yield WaitForSeconds(9.0); isExamineOnList=false; showExamine2=false; showBox2=true;} 
     function KeyBox2(){
     yield WaitForSeconds(3.0); showKey2=false; showBox2=true; } 

I apologize for including all of my code but I have no idea what is wrong. The basis of what this is is that a for function detects if the typed phrase is on a list of keywords, and depending on the area, certain text boxes are put into use. However, particularly after typing an "examine" keyword, it will execute perfectly. The next code, however will not clear the previous text box, making 2 on the screen at once. The next detected phrase that is on the list will only clear the previous phrase, and then the game will function as normal. If the isExamineOnList of the bottom functions is removed, then the next text box will not even appear, going back to whatever the examine function was. From then on in that case, all keywords will lead to examine. Pictures of text box meshing: (caused by examine and then exit, both text boxes with original room descriptions active) (mesh of get key text and normal box2 text performed after examine. This did resolve itself after the get key had 3 seconds pass).

This is a very weird bug and I would appreciate any help you could give.

EDIT: sorry for not formatting all of the text to code- resolved.