Fix problem and contest clone

judge/views/contests.py

@@ -1,3 +1,4 @@
+from copy import deepcopy
 import json
 import math
 from calendar import Calendar, SUNDAY
@@ -417,13 +418,13 @@ class ContestClone(
     permission_required = "judge.clone_contest"
 
     def form_valid(self, form):
-        contest = self.object
+        tags = self.object.tags.all()
+        organizations = self.object.organizations.all()
+        private_contestants = self.object.private_contestants.all()
+        view_contest_scoreboard = self.object.view_contest_scoreboard.all()
+        contest_problems = self.object.contest_problems.all()
 
-        tags = contest.tags.all()
-        organizations = contest.organizations.all()
-        private_contestants = contest.private_contestants.all()
-        view_contest_scoreboard = contest.view_contest_scoreboard.all()
-        contest_problems = contest.contest_problems.all()
+        contest = deepcopy(self.object)
 
         contest.pk = None
         contest.is_visible = False

judge/views/problem.py

@@ -5,6 +5,7 @@ from datetime import timedelta, datetime
 from operator import itemgetter
 from random import randrange
 import random
+from copy import deepcopy
 
 from django.conf import settings
 from django.contrib.auth.decorators import login_required
@@ -1183,11 +1184,12 @@ class ProblemClone(
     permission_required = "judge.clone_problem"
 
     def form_valid(self, form):
-        problem = self.object
+        languages = self.object.allowed_languages.all()
+        language_limits = self.object.language_limits.all()
+        types = self.object.types.all()
+
+        problem = deepcopy(self.object)
 
-        languages = problem.allowed_languages.all()
-        language_limits = problem.language_limits.all()
-        types = problem.types.all()
         problem.pk = None
         problem.is_public = False
         problem.ac_rate = 0