diff --git a/changelog.d/1583-workflow-runs-dedup.fixed.md b/changelog.d/1583-workflow-runs-dedup.fixed.md
new file mode 100644
index 00000000..5c8cb099
--- /dev/null
+++ b/changelog.d/1583-workflow-runs-dedup.fixed.md
@@ -0,0 +1 @@
+With no run active and the last attempt failed, the workflow **Runs** tab listed that same attempt twice: a phantom row for the live run plus its own history row. It now lists one row per attempt — the failed attempt appears once, marked `Failed` — while a real retry still shows the earlier attempt and the current one ([#1583](https://github.com/ThinkFlowLab/FlyBot/issues/1583)).
diff --git a/plugins/workflow/client.js b/plugins/workflow/client.js
index 750fa802..21c1a8f6 100644
--- a/plugins/workflow/client.js
+++ b/plugins/workflow/client.js
@@ -693,7 +693,11 @@ window.__ModuleLoader__.load({
         current: workflow.run?.id === run.id,
       }))
       for (const task of queued) rows.push({ task, status: 'queued', current: false })
-      const seen = new Set(rows.map(row => row.id ?? `${row.task?.id ?? ''}|${row.at ?? ''}`))
+      const seen = new Set()
+      for (const row of rows) {
+        if (row.id) seen.add(row.id)
+        seen.add(`${row.task?.id ?? ''}|${row.at ?? ''}`)
+      }
       for (const item of history) {
         const key = item.id ?? `${item.task?.id ?? ''}|${item.at ?? ''}`
         if (seen.has(key)) continue
diff --git a/plugins/workflow/test/client.test.js b/plugins/workflow/test/client.test.js
index 0746bcd4..3d209dd6 100644
--- a/plugins/workflow/test/client.test.js
+++ b/plugins/workflow/test/client.test.js
@@ -931,6 +931,36 @@ test('run history does not invent a second running row when only one live run ex
   assert.equal(rows.filter(row => row.status === 'running').length, 1)
 })
 
+test('a failed live attempt is listed once, as failed, not as its own history row (#1583)', () => {
+  const task = { id: '#1422', title: 'PR 1422' }
+  const workflow = {
+    activeCount: 0,
+    queue: [],
+    runs: [{ id: 'run-a', live: true, status: 'failed', task, updatedAt: 1_700_000_000_000 }],
+    run: { id: 'run-a', live: true, status: 'failed', task, updatedAt: 1_700_000_000_000 },
+    history: [{ task, status: 'failed', at: 1_700_000_000_000 }],
+  }
+  const rows = client.runHistoryRows(workflow)
+  assert.equal(rows.length, 1)
+  assert.equal(rows[0].status, 'failed')
+  assert.equal(rows.filter(row => row.status === 'running').length, 0)
+})
+
+test('a genuine retry still shows the failed attempt and the current one (#1583)', () => {
+  const task = { id: '#1422', title: 'PR 1422' }
+  const workflow = {
+    activeCount: 1,
+    queue: [],
+    runs: [{ id: 'run-b', live: true, status: 'running', task, updatedAt: 1_700_000_100_000 }],
+    run: { id: 'run-b', live: true, status: 'running', task, updatedAt: 1_700_000_100_000 },
+    history: [{ task, status: 'failed', at: 1_700_000_000_000 }],
+  }
+  const rows = client.runHistoryRows(workflow)
+  assert.equal(rows.length, 2)
+  assert.deepEqual(rows.map(row => row.status), ['running', 'failed'])
+  assert.deepEqual(rows.map(row => row.current), [true, false])
+})
+
 test('the runs tab shows one running row per concurrent live run', async () => {
   const graph = delivery()
   graph.activeCount = 2