Переделал страницу с ObjItem. Теперь работает корректно.

dbapp/mainapp/urls.py

@@ -6,9 +6,9 @@ from . import views
 app_name = 'mainapp'
 
 urlpatterns = [
-    path('', views.SourceListView.as_view(), name='home'),  # Source list page
-    path('objitems/', views.ObjItemListView.as_view(), name='objitem_list'),  # Objects list page
-    path('actions/', views.ActionsPageView.as_view(), name='actions'),  # Move actions to a separate page
+    path('', views.SourceListView.as_view(), name='home'),
+    path('objitems/', views.ObjItemListView.as_view(), name='objitem_list'),
+    path('actions/', views.ActionsPageView.as_view(), name='actions'),
     path('excel-data', views.LoadExcelDataView.as_view(), name='load_excel_data'),
     path('satellites', views.AddSatellitesView.as_view(), name='add_sats'),
     path('api/locations/<int:sat_id>/geojson/', views.GetLocationsView.as_view(), name='locations_by_id'),