course list ordering fix

apps/course/views/course.py

@@ -122,7 +122,9 @@ class CourseListAPIView(ListAPIView):
         queryset = Course.objects.select_related(
             'category',
             'professor'
-        ).exclude(status__contains=[{"title": Course.StatusChoices.INACTIVE}])
+        ).exclude(
+            status__contains=[{"title": Course.StatusChoices.INACTIVE}]
+        ).order_by('-created_at', '-id')
 
         request = self.request
         filters = request.query_params