diff --git a/src/nationalarchives/components/nested-navigation/_index.scss b/src/nationalarchives/components/nested-navigation/_index.scss
index 8bc021d..0364815 100644
--- a/src/nationalarchives/components/nested-navigation/_index.scss
+++ b/src/nationalarchives/components/nested-navigation/_index.scss
@@ -3,7 +3,7 @@
   --directory-icon-width: 24px;
   --item-expander-btn-width: 40px;
 
-  overflow: auto auto;
+  overflow: auto;
   max-height: 70vh;
   margin-bottom: 1em;
 }
diff --git a/src/nationalarchives/components/nested-navigation/nested-navigation.ts b/src/nationalarchives/components/nested-navigation/nested-navigation.ts
index a7eff7a..50e59a3 100644
--- a/src/nationalarchives/components/nested-navigation/nested-navigation.ts
+++ b/src/nationalarchives/components/nested-navigation/nested-navigation.ts
@@ -215,7 +215,7 @@ export class NestedNavigation {
     const label = li.querySelector("label");
     if (label?.firstChild?.textContent !== null) {
       this.displaySelected(
-        isSelected ? "" : label?.firstChild?.textContent?.trim() ?? "",
+        isSelected ? "" : (label?.firstChild?.textContent?.trim() ?? ""),
       );
     } else {
       this.displaySelected("");