diff --git a/models/pos_order.py b/models/pos_order.py
index 5d80b1d..40f2a13 100644
--- a/models/pos_order.py
+++ b/models/pos_order.py
@@ -82,14 +82,21 @@ class PosOrder(models.Model):
             line_notes = []
             for line in order['lines']:
                 if len(line) >= 3 and isinstance(line[2], dict) and line[2].get('customer_note'):
-                    line_notes.append(line[2]['customer_note'].strip())
+                    note = line[2]['customer_note'].strip()
+                    if note:
+                        line_notes.append(note)
             
             if line_notes:
-                combined_notes = " / ".join(line_notes)
-                if order.get('general_customer_note'):
-                    order['general_customer_note'] = f"{order['general_customer_note']} / {combined_notes}"
-                else:
-                    order['general_customer_note'] = combined_notes
+                current_note = order.get('general_customer_note') or ""
+                existing_parts = [p.strip() for p in current_note.split(" / ")] if current_note else []
+                new_notes = [n for n in line_notes if n not in existing_parts]
+                
+                if new_notes:
+                    combined_notes = " / ".join(new_notes)
+                    if current_note:
+                        order['general_customer_note'] = f"{current_note} / {combined_notes}"
+                    else:
+                        order['general_customer_note'] = combined_notes
 
         return super(PosOrder, self)._process_order(order, existing_order)