diff --git a/backend/app/services/counts_pivot_layout.rb b/backend/app/services/counts_pivot_layout.rb
index e523a34..2d9e897 100644
--- a/backend/app/services/counts_pivot_layout.rb
+++ b/backend/app/services/counts_pivot_layout.rb
@@ -28,6 +28,7 @@ class CountsPivotLayout
     result = []
     values.each_with_index do |tuple, index|
       result << { values: tuple, kind: 'data' }
+      # A group continuing on the next page closes only on its final page.
       following = values[index + 1] || next_values
       depths.reverse_each do |depth|
         prefix = tuple.first(depth)
diff --git a/backend/spec/services/counts_pivot_security_spec.rb b/backend/spec/services/counts_pivot_security_spec.rb
index 19d0eac..337d7a5 100644
--- a/backend/spec/services/counts_pivot_security_spec.rb
+++ b/backend/spec/services/counts_pivot_security_spec.rb
@@ -45,17 +45,28 @@ RSpec.describe 'Counts masked pivot contracts' do
   end
 
   it 'preserves monthly name subtotals and grand totals across pages' do
-    settings = { 'resource' => 'tags', 'rows' => 'created_at:month name_ja' }
+    settings = { 'resource' => 'tags', 'rows' => 'created_at:month name' }
     complete = result(admin, settings)
-    paged = result(admin, settings.merge('limit' => '1'))
     expect(complete[:group_count]).to eq(3)
     expect(grand(complete)).to eq(3)
-    expect(grand(paged)).to eq(3)
-    subtotal = paged[:pivot_totals].find do |cell|
-      cell[:row] == ['2023-01'] && cell[:column].empty?
+    (1..3).each do |page|
+      paged = result(admin, settings.merge('limit' => '1', 'page' => page.to_s))
+      expect(grand(paged)).to eq(3)
+      subtotal = paged[:pivot_totals].find do |cell|
+        cell[:row] == ['2023-01'] && cell[:column].empty?
+      end
+      headers = paged[:row_headers].select { _1[:kind] == 'subtotal' }
+      if page == 3
+        expect(headers.map { _1[:values] }).to eq([['2023-01']])
+        expect(subtotal).not_to be_nil
+        expect(subtotal[:count]).to eq(3)
+      else
+        expect(headers).to eq([])
+        expect(subtotal).to be_nil
+      end
+      expect(paged[:cells].sum { _1[:count] }).to eq(1)
+      expect(paged[:group_count]).to eq(3)
     end
-    expect(subtotal[:count]).to eq(3)
-    expect(paged[:cells].sum { _1[:count] }).to eq(1)
   end
 
   it 'preserves five tag occurrences after merging private tags and across pages' do
diff --git a/frontend/server.ssr.test.mjs b/frontend/server.ssr.test.mjs
index d847913..cae7986 100644
--- a/frontend/server.ssr.test.mjs
+++ b/frontend/server.ssr.test.mjs
@@ -348,7 +348,11 @@ test ('counts SSR renders the shell without result requests or embedded results'
       assert.match (result.html, /<form[\s>]/)
       assert.doesNotMatch (result.html, /counts:|columns\.changedAt|fields\.actor/)
       assert.match (result.head, /<meta[^>]*name="robots"[^>]*content="noindex"/)
-      assert.match (result.head, /<title[^>]*>[^<]*集計[^<]*\|[^<]*<\/title>/)
+      const titles = {
+        ja: { posts: '広場集計', tags: 'タグ集計' },
+        'ain-Kana': { posts: 'ミンタㇻ　ウコピㇱキ', tags: 'シロシ　ウコピㇱキ' } }
+      assert.match (result.head, new RegExp (
+        `<title[^>]*>${titles[locale][resource]} \\|[^<]*<\/title>`))
       assert.match (result.head, /rel="canonical"/)
       assert.doesNotMatch (result.html, /private-discard|hidden-title|__counts_private__/)
 
diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts
index 593ad38..d08c97d 100644
--- a/frontend/vitest.config.ts
+++ b/frontend/vitest.config.ts
@@ -7,6 +7,7 @@ export default mergeConfig (
     viteConfig,
     defineConfig ({
 	test: { environment:  'jsdom',
+		testTimeout: 30_000,
 		exclude: ['**/node_modules/**', '**/dist/**', 'server.ssr.test.mjs'],
 		setupFiles:   './src/test/setup.ts',
 		globals:      false } }))