diff --git a/src/scripts/anim.ts b/src/scripts/anim.ts
index 557ce5a..ea96503 100644
--- a/src/scripts/anim.ts
+++ b/src/scripts/anim.ts
@@ -118,8 +118,12 @@ function initNav(): void {
 
   for (const a of links) {
     a.addEventListener("pointerenter", () => under(a, true));
+    // On leave, keep the underline only if this link IS the active scroll-spy
+    // section. Guard on activeIdx >= 0 so that when nothing is active — e.g. the
+    // Projects/Blog pages, where none of these sections exist and activeIdx stays
+    // -1 — a hovered tab doesn't stick lit via the -1 === indexOf(non-member) -1.
     a.addEventListener("pointerleave", () =>
-      under(a, sectioned.indexOf(a) === activeIdx),
+      under(a, activeIdx >= 0 && sectioned.indexOf(a) === activeIdx),
     );
   }