diff --git a/framework/framework/package.json b/framework/framework/package.json
index e08bb0b7f..665bd3a9a 100644
--- a/framework/framework/package.json
+++ b/framework/framework/package.json
@@ -9,7 +9,7 @@
     },
     "dependencies": {
         "@hydrooj/utils": "workspace:^",
-        "@koa/router": "^15.1.0",
+        "@koa/router": "^15.1.1",
         "@mongodb-js/saslprep": "^1.4.4",
         "emoji-regex": "^10.6.0",
         "fs-extra": "^11.3.2",
diff --git a/packages/hydrooj/src/handler/record.ts b/packages/hydrooj/src/handler/record.ts
index 6543cb5e2..e23094270 100644
--- a/packages/hydrooj/src/handler/record.ts
+++ b/packages/hydrooj/src/handler/record.ts
@@ -190,12 +190,12 @@ export class RecordDetailHandler extends ContestDetailBaseHandler {
         canViewCode ||= this.user.hasPerm(PERM.PERM_READ_RECORD_CODE);
         canViewCode ||= this.user.hasPerm(PERM.PERM_READ_RECORD_CODE_ACCEPT) && self?.status === STATUS.STATUS_ACCEPTED;
         if (this.tdoc) {
-            const tsdoc = await contest.getStatus(domainId, this.tdoc.docId, this.user._id);
+            this.tsdoc = await contest.getStatus(domainId, this.tdoc.docId, this.user._id);
             canViewCode ||= this.user.own(this.tdoc);
             if (this.tdoc.allowViewCode && contest.isDone(this.tdoc)) {
-                canViewCode ||= tsdoc?.attend;
+                canViewCode ||= this.tsdoc?.attend;
             }
-            if (!tsdoc?.attend && pdoc && !problem.canViewBy(pdoc, this.user)) throw new PermissionError(PERM.PERM_VIEW_PROBLEM_HIDDEN);
+            if (!this.tsdoc?.attend && pdoc && !problem.canViewBy(pdoc, this.user)) throw new PermissionError(PERM.PERM_VIEW_PROBLEM_HIDDEN);
         } else if (pdoc && !problem.canViewBy(pdoc, this.user)) throw new PermissionError(PERM.PERM_VIEW_PROBLEM_HIDDEN);
         if (!canViewCode) {
             rdoc.code = '';
diff --git a/packages/hydrooj/src/service/server.ts b/packages/hydrooj/src/service/server.ts
index 79159f924..db97e7a77 100644
--- a/packages/hydrooj/src/service/server.ts
+++ b/packages/hydrooj/src/service/server.ts
@@ -135,7 +135,7 @@ export async function apply(ctx: Context) {
                 for (const kwargs of kwargsList) {
                     for (const key in kwargs) {
                         if (kwargs[key] instanceof ObjectId) args[key] = kwargs[key].toHexString();
-                        else args[key] = kwargs[key].toString().replace(/\//g, '%2F');
+                        else if (key !== 'query') args[key] = kwargs[key].toString().replace(/\//g, '%2F');
                     }
                     for (const key in kwargs.query || {}) {
                         if (query[key] instanceof ObjectId) query[key] = kwargs.query[key].toHexString();
@@ -153,6 +153,7 @@ export async function apply(ctx: Context) {
                             ? (!host.includes(this.request.host))
                             : this.request.host !== host)
                     )) withDomainId ||= domainId;
+                    delete args.query;
                     res = server.router.url(name, args, { query }).toString();
                     if (anchor) res = `${res}#${anchor}`;
                     if (withDomainId) res = `/d/${withDomainId}${res}`;
diff --git a/packages/ui-default/components/contest/contest.page.styl b/packages/ui-default/components/contest/contest.page.styl
index 3a1229523..1d84da592 100644
--- a/packages/ui-default/components/contest/contest.page.styl
+++ b/packages/ui-default/components/contest/contest.page.styl
@@ -64,6 +64,9 @@ for key, value in $contest-color
   padding-bottom: 0.5rem;
   width: rem(180px);
 
+  +mobile()
+    display: none;
+
   > a
     text-decoration: none;
     background-color: transparent;
diff --git a/packages/ui-default/templates/problem_detail.html b/packages/ui-default/templates/problem_detail.html
index d68c08486..30c2c9874 100644
--- a/packages/ui-default/templates/problem_detail.html
+++ b/packages/ui-default/templates/problem_detail.html
@@ -63,15 +63,16 @@
               </button>
             </form>
           {% endif %}
+          {%- if not tdoc or tdoc.pids|length > 1 -%}
           {%- if tdoc -%}
             {{ utils.getAlphabeticId(tdoc.pids.indexOf(pdoc.docId)) }}
           {%- elif pdoc.pid and pdoc.pid.includes('-') -%}
             {{ pdoc.pid.split('-').join('#') }}
           {%- else -%}
             #{{ pdoc.pid|default(pdoc.docId) }}
-          {%- endif -%}. {{ pdoc.title }}
+          {%- endif -%}. {% endif %}{{ pdoc.title }}
         </h1>
-        {% if tdoc and tdoc.pids|length <= 26 %}
+        {% if tdoc and tdoc.pids|length <= 26 and tdoc.pids|length > 1 %}
           <div class="section__tools contest-problems">
             {% for pid in tdoc.pids -%}
               {% set status = tsdoc.detail[pid].status %}