diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 91bcf24ee..1a13f48d5 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.28.11",
+    "version": "2.28.12",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/contest.ts b/packages/hydrooj/src/handler/contest.ts
index dda0378b2..5d260fc23 100644
--- a/packages/hydrooj/src/handler/contest.ts
+++ b/packages/hydrooj/src/handler/contest.ts
@@ -219,8 +219,9 @@ export class ContestEditHandler extends Handler {
         title: string, content: string, rule: string, _pids: string, rated = false,
     ) {
         const pids = _pids.replace(/，/g, ',').split(',').map((i) => {
+            i = i.trim();
             if ((+i).toString() === i) return +i;
-            return i.trim();
+            return i;
         }).filter((i) => i);
         const beginAtMoment = moment.tz(`${beginAtDate} ${beginAtTime}`, this.user.timeZone);
         if (!beginAtMoment.isValid()) throw new ValidationError('beginAtDate', 'beginAtTime');
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index d98eb25ee..466805f92 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -306,8 +306,9 @@ class HomeworkEditHandler extends Handler {
         penaltyRules: PenaltyRules, title: string, content: string, _pids: string, rated = false,
     ) {
         const pids = _pids.replace(/，/g, ',').split(',').map((i) => {
+            i = i.trim();
             if ((+i).toString() === i) return +i;
-            return i.trim();
+            return i;
         }).filter((i) => i);
         const tdoc = tid
             ? await contest.get(domainId, tid, document.TYPE_HOMEWORK)
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index f710619f2..8938831b8 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.11.5",
+  "version": "4.11.6",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/templates/problem_detail.html b/packages/ui-default/templates/problem_detail.html
index 2829451cb..5f12a0d7d 100644
--- a/packages/ui-default/templates/problem_detail.html
+++ b/packages/ui-default/templates/problem_detail.html
@@ -12,8 +12,8 @@
 }) }}
 {% if tdoc %}
   {{ set(UiContext, 'canViewRecord', model.contest.canShowRecord.call(handler, tdoc)) }}
-  {{ set(UiContext, 'postSubmitUrl', url('contest_detail_problem_submit' if tdoc.docType == model.document.TYPE_CONTEST else 'homework_detail_problem_submit', pid=pdoc.docId, tid=tdoc.docId)) }}
-  {{ set(UiContext, 'getSubmissionsUrl', url('contest_detail_problem_submit' if tdoc.docType == model.document.TYPE_CONTEST else 'homework_detail_problem_submit', pid=pdoc.docId, tid=tdoc.docId)) }}
+  {{ set(UiContext, 'postSubmitUrl', url('contest_detail_problem_submit' if tdoc.docType == model.document.TYPE_CONTEST else 'homework_detail_problem_submit', pid=pdoc.pid, tid=tdoc.docId)) }}
+  {{ set(UiContext, 'getSubmissionsUrl', url('contest_detail_problem_submit' if tdoc.docType == model.document.TYPE_CONTEST else 'homework_detail_problem_submit', pid=pdoc.pid, tid=tdoc.docId)) }}
   {{ set(UiContext, 'getRecordDetailUrl', url('record_detail', rid='{rid}', query={tid:tdoc.docId})) }}
   {{ set(UiContext, 'pretestConnUrl', "/record-conn?pretest=1&uid=" + handler.user._id + "&pid=" + pdoc.docId + "&domainId=" + handler.domainId + "&tid=" + tdoc.docId) }}
 {% else %}