diff --git a/eds_utils/core/eds.py b/eds_utils/core/eds.py
index 0f77b66..b9fbf23 100644
--- a/eds_utils/core/eds.py
+++ b/eds_utils/core/eds.py
@@ -1,6 +1,7 @@
 from datetime import datetime
 from dataclasses import dataclass, field
 from typing import Dict, List
+from copy import deepcopy
 
 from . import DataType
 from .objects import Variable, Record
@@ -301,7 +302,7 @@ def tpdos(self) -> int:
     def indexes(self) -> List[int]:
         '''The list of indexes in the OD'''
 
-        return sorted(self._data.keys())
+        return list(self._data.keys())
 
     @property
     def mandatory_objects(self) -> List[int]:
@@ -375,9 +376,9 @@ def copy_object(self, index: int, subindex: int, new_index: int, new_subindex: i
         obj = self._data[index] if subindex is None else self._data[index][subindex]
 
         if new_subindex is None:
-            self._data[new_index] = obj
+            self._data[new_index] = deepcopy(obj)
         else:
-            self._data[new_index][new_subindex] = obj
+            self._data[new_index][new_subindex] = deepcopy(obj)
 
         if move:
             if subindex is None:
diff --git a/eds_utils/core/objects.py b/eds_utils/core/objects.py
index 7a2abc6..090e3c1 100644
--- a/eds_utils/core/objects.py
+++ b/eds_utils/core/objects.py
@@ -1,6 +1,7 @@
 '''All the object class for the object dictionary'''
 
 from dataclasses import dataclass
+from typing import List
 
 from . import DataType, AccessType, ObjectType
 
@@ -109,10 +110,10 @@ def __delitem__(self, subindex: int):
         self._data[0].default_value = f'0x{len(self._data) - 1:02X}'
 
     @property
-    def subindexes(self) -> list:
+    def subindexes(self) -> List[int]:
         '''Get the list of subindexes'''
 
-        return self._data.keys()
+        return list(self._data.keys())
 
     @property
     def storage_location(self) -> str: