CustomPropertyDrawer, 2D Array, Limits Y Length of Array?

Hi there,
I am using a CustomPropertyDrawer to create a 2D Array that will display in my editor, inspector. My issue is that, for some reason, the second length of the array, so array[x,y], if y > 8, I get an error, of out of index range.

I am unsure why.

I can set the x comfortably, and as long as the y is < 8, I can create any 2D array for my inspector, but over that, it clips out.

Why is this?

Code (csharp):

1.  
2. //editor script.
3.  
4.  
5. using System.Collections;
6. using UnityEditor;
7. using UnityEngine;
8.  
9.  
10.  
11.  
12.  
13. [CustomPropertyDrawer(typeof(EditorLevelLayout))]
14. public class GUILevelLayout : PropertyDrawer
15. {
16.  
17.  
18.  
19.     public override void OnGUI(Rect position, SerializedProperty property, GUIContent label){
20.  
21.  
22.  
23.         EditorGUI.PrefixLabel(position, label);
24.  
25.  
26.         Rect newPosition = position;
27.         newPosition.y += 20f;
28.         SerializedProperty row = property.FindPropertyRelative("row");
29.  
30.    
31.         int editorHeight = 12;
32.         int editorWidth = 11;
33.  
34.  
35.         for (int i = 0; i < editorHeight; i++){
36.             Debug.Log(i + " i " + editorHeight);
37.  
38.  
39.             SerializedProperty column = row.GetArrayElementAtIndex(i).FindPropertyRelative("column");
40.  
41.             newPosition.height = 20;
42.             newPosition.width = 20;
43.  
44.  
45.             if(column.arraySize != editorWidth){
46.                 column.arraySize = editorWidth;
47.             }
48.  
49.  
50.             for (int m = 0; m < editorWidth; m++){
51.                 Debug.Log(m + " m " + editorWidth);
52.                 EditorGUI.PropertyField(newPosition, column.GetArrayElementAtIndex(m), GUIContent.none);
53.                 newPosition.x += newPosition.width;
54.  
55.             }
56.  
57.  
58.             newPosition.x = position.x;
59.             newPosition.y += 20;
60.  
61.  
62.         }
63.  
64.     }
65.  
66.  
67.  
68.  
69.     public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
70.     {
71.         return base.GetPropertyHeight(property, label);
72.     }
73.  
74.  
75.  
76.  
77.  
78. }
79.  
80.  

Code (csharp):

1.  
2.  
3.  
4. using System.Collections;
5. using UnityEngine;
6.  
7. [System.Serializable]
8. public class EditorLevelLayout{
9.  
10.  
11.  
12.     [System.Serializable]
13.     public struct rowData{
14.  
15.         public int[] column;
16.  
17.     }
18.  
19.     public rowData[] row = new rowData[12];
20.  
21.  
22. }
23.