diff --git a/containers/libreportal/frontend/components/backup/configuration/js/backup-retention-presets.js b/containers/libreportal/frontend/components/backup/configuration/js/backup-retention-presets.js
index 46b33eb..03bad93 100644
--- a/containers/libreportal/frontend/components/backup/configuration/js/backup-retention-presets.js
+++ b/containers/libreportal/frontend/components/backup/configuration/js/backup-retention-presets.js
@@ -64,6 +64,9 @@ Object.assign(BackupPage.prototype, {
 
         const applyVisibility = (presetKey) => {
             const isCustom = presetKey === 'custom';
+            // Gate the block's divider on custom too — it separates the dropdown
+            // from the Keep-* fields, which only show in the custom state.
+            block.classList.toggle('is-custom', isCustom);
             wrappers.forEach(w => { if (w) w.style.display = isCustom ? '' : 'none'; });
         };
         applyVisibility(preset);
diff --git a/containers/libreportal/frontend/components/backup/core/css/backup.css b/containers/libreportal/frontend/components/backup/core/css/backup.css
index 84b995e..b4be3a9 100755
--- a/containers/libreportal/frontend/components/backup/core/css/backup.css
+++ b/containers/libreportal/frontend/components/backup/core/css/backup.css
@@ -713,6 +713,13 @@
     display: flex;
     flex-direction: column;
     gap: 6px;
+}
+
+/* The divider (and its spacing) belongs only to the "Custom" state: the Keep-*
+   fields it separates the dropdown from are hidden for every preset except
+   custom, so otherwise it's an orphaned line under the dropdown. The .is-custom
+   class is toggled by applyVisibility() in the retention enhancer. */
+.backup-retention-preset-block.is-custom {
     padding-bottom: 14px;
     margin-bottom: 6px;
     border-bottom: 1px solid rgba(var(--text-rgb), 0.08);