diff --git a/modules/structs/issue.go b/modules/structs/issue.go
index 70f5e1ba8eaa1..25c6251fbf2d3 100644
--- a/modules/structs/issue.go
+++ b/modules/structs/issue.go
@@ -5,7 +5,7 @@
 package structs
 
 import (
-	"path/filepath"
+	"path"
 	"time"
 )
 
@@ -163,11 +163,11 @@ const (
 
 // Type returns the type of IssueTemplate, can be "md", "yaml" or empty for known
 func (it IssueTemplate) Type() IssueTemplateType {
-	if it.Name == "config.yaml" || it.Name == "config.yml" {
+	if base := path.Base(it.FileName); base == "config.yaml" || base == "config.yml" {
 		// ignore config.yaml which is a special configuration file
 		return ""
 	}
-	if ext := filepath.Ext(it.FileName); ext == ".md" {
+	if ext := path.Ext(it.FileName); ext == ".md" {
 		return IssueTemplateTypeMarkdown
 	} else if ext == ".yaml" || ext == ".yml" {
 		return IssueTemplateTypeYaml
diff --git a/modules/structs/issue_test.go b/modules/structs/issue_test.go
new file mode 100644
index 0000000000000..5312585d0f0f4
--- /dev/null
+++ b/modules/structs/issue_test.go
@@ -0,0 +1,43 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package structs
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIssueTemplate_Type(t *testing.T) {
+	tests := []struct {
+		fileName string
+		want     IssueTemplateType
+	}{
+		{
+			fileName: ".gitea/ISSUE_TEMPLATE/bug_report.yaml",
+			want:     IssueTemplateTypeYaml,
+		},
+		{
+			fileName: ".gitea/ISSUE_TEMPLATE/bug_report.md",
+			want:     IssueTemplateTypeMarkdown,
+		},
+		{
+			fileName: ".gitea/ISSUE_TEMPLATE/bug_report.txt",
+			want:     "",
+		},
+		{
+			fileName: ".gitea/ISSUE_TEMPLATE/config.yaml",
+			want:     "",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.fileName, func(t *testing.T) {
+			it := IssueTemplate{
+				FileName: tt.fileName,
+			}
+			assert.Equal(t, tt.want, it.Type())
+		})
+	}
+}
diff --git a/web_src/js/markup/math.js b/web_src/js/markup/math.js
index 5790a327a51f6..d4e40d5be2e34 100644
--- a/web_src/js/markup/math.js
+++ b/web_src/js/markup/math.js
@@ -23,12 +23,14 @@ export async function renderMath() {
 
   for (const el of els) {
     const source = el.textContent;
-    const options = {display: el.classList.contains('display')};
+    const nodeName = el.classList.contains('display') ? 'p' : 'span';
 
     try {
-      const markup = katex.renderToString(source, options);
-      const tempEl = document.createElement(options.display ? 'p' : 'span');
-      tempEl.innerHTML = markup;
+      const tempEl = document.createElement(nodeName);
+      katex.render(source, tempEl, {
+        maxSize: 25,
+        maxExpand: 50,
+      });
       targetElement(el).replaceWith(tempEl);
     } catch (error) {
       displayError(el, error);