Same using lastUpdated as key

Views/Profile.js

@@ -139,7 +139,7 @@ let Profile = ({ navigation, route }) => {
                     <FlatList
                         data={Posts}
                         renderItem={renderPost}
-                        keyExtractor={item => item._id || item.createdAt}
+                        keyExtractor={item => item.lastUpdated || item._id  || item.ceatedAt}
                         ListHeaderComponent={header}
                         refreshing={Posts.length === 0}
                         initialNumToRender={3}