diff --git a/src/ui.js b/src/ui.js
index 93a402c..77e0f74 100644
--- a/src/ui.js
+++ b/src/ui.js
@@ -368,10 +368,13 @@ export function toggleInfoEdit() {
     return fetch(`${S.cfg.backendUrl}/api/song-sorttags?${p}`).then(r => r.ok ? r.json() : null).catch(() => null);
   }).then(t => {
     if (!t) return;
-    if (t.titleSort)       document.getElementById('ie-titlesort').value       = t.titleSort;
-    if (t.artistSort)      document.getElementById('ie-artistsort').value      = t.artistSort;
-    if (t.albumArtistSort) document.getElementById('ie-albumartistsort').value = t.albumArtistSort;
-    if (t.albumSort)       document.getElementById('ie-albumsort').value       = t.albumSort;
+    const _jp = /[ぁ-んァ-ン一-龯]/;
+    // Only use file sort tags if they are non-Japanese (romaji/ASCII) — Japanese sort tags
+    // in the file are incorrect and should be ignored in favour of the romaji index value.
+    if (t.titleSort       && !_jp.test(t.titleSort))       document.getElementById('ie-titlesort').value       = t.titleSort;
+    if (t.artistSort      && !_jp.test(t.artistSort))      document.getElementById('ie-artistsort').value      = t.artistSort;
+    if (t.albumArtistSort && !_jp.test(t.albumArtistSort)) document.getElementById('ie-albumartistsort').value = t.albumArtistSort;
+    if (t.albumSort       && !_jp.test(t.albumSort))       document.getElementById('ie-albumsort').value       = t.albumSort;
   }).catch(() => {});
 
   // Art preview — use existing cover