diff --git a/forms/mainwindow.py b/forms/mainwindow.py
--- a/forms/mainwindow.py
+++ b/forms/mainwindow.py
@@ -51,6 +51,8 @@ class CustomTableModel(QtCore.QAbstractT
     def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
         if orientation == QtCore.Qt.Horizontal and role == QtCore.Qt.DisplayRole:
             return QtCore.QVariant(self.headers[section])
+        elif orientation == QtCore.Qt.Vertical and role == QtCore.Qt.DisplayRole:
+            return QtCore.QVariant(section)
         return super().headerData(section, orientation, role)
 
     def rowCount(self, parent=None):