diff --git a/ui/src/pages/ProductionProductCostingHasCostDetail.vue b/ui/src/pages/ProductionProductCostingHasCostDetail.vue
index 5f44998..1b3593a 100644
--- a/ui/src/pages/ProductionProductCostingHasCostDetail.vue
+++ b/ui/src/pages/ProductionProductCostingHasCostDetail.vue
@@ -2836,10 +2836,16 @@ function recalculateDetailRow (row, options = {}) {
 }
 
 function recalculateAllDetailRows () {
-  detailGroups.value = detailGroups.value.map(grp => ({
-    ...grp,
-    items: (Array.isArray(grp?.items) ? grp.items : []).map(row => recalculateDetailRow({ ...row }, { preserveInputs: true }))
-  }))
+  // Preserve row identity. QTable editors and the computed group totals must
+  // observe the exact same reactive row objects. Replacing rows with
+  // `{ ...row }` after the async exchange-rate request left QTable editing an
+  // older object while totals watched the replacement object.
+  detailGroups.value.forEach(grp => {
+    const items = Array.isArray(grp?.items) ? grp.items : []
+    items.forEach(row => {
+      recalculateDetailRow(row, { preserveInputs: true })
+    })
+  })
 }
 
 function resolveRowTRYTutar (row) {
@@ -3420,25 +3426,23 @@ async function fetchBulkItemPrices () {
     }
 
     let appliedCount = 0
-    detailGroups.value = detailGroups.value.map(grp => ({
-      ...grp,
-      items: (Array.isArray(grp?.items) ? grp.items : []).map(row => {
+    detailGroups.value.forEach(grp => {
+      const items = Array.isArray(grp?.items) ? grp.items : []
+      items.forEach(row => {
         const match = updates.find(update => rowMatchesBulkUpdate(row, update))
-        if (!match) return row
+        if (!match) return
         appliedCount += 1
-        return recalculateDetailRow({
-          ...row,
-          inputPrice: match.inputPrice,
-          fiyat_girilen: match.fiyat_girilen,
-          inputPricePrBr: match.inputPricePrBr,
-          fiyat_doviz: match.fiyat_doviz
-        }, {
+        row.inputPrice = match.inputPrice
+        row.fiyat_girilen = match.fiyat_girilen
+        row.inputPricePrBr = match.inputPricePrBr
+        row.fiyat_doviz = match.fiyat_doviz
+        recalculateDetailRow(row, {
           priceType: match.priceType || 'SAF',
           updateState: 'bulk',
           markChanged: true
         })
       })
-    }))
+    })
     // Update sub-headers immediately after the bulk response is applied. Do
     // not wait for the optional previous-cost autofill request below.
     triggerUIUpdate()
@@ -3481,14 +3485,14 @@ async function fetchBulkItemPrices () {
         })
 
         let filled = 0
-        detailGroups.value = detailGroups.value.map(grp => ({
-          ...grp,
-          items: (Array.isArray(grp?.items) ? grp.items : []).map(row => {
-            if (!row?.requiredPlaceholder) return row
-            if (isCMGroupName(row?.sAciklama3) || normalizeGroupName(row?.sAciklama3) === 'FABRIC') return row
+        detailGroups.value.forEach(grp => {
+          const items = Array.isArray(grp?.items) ? grp.items : []
+          items.forEach(row => {
+            if (!row?.requiredPlaceholder) return
+            if (isCMGroupName(row?.sAciklama3) || normalizeGroupName(row?.sAciklama3) === 'FABRIC') return
             const no = parseInt(String(row?.nHammaddeTuruNo || '').trim() || '0', 10) || 0
             const hit = byNo[no]
-            if (!hit) return row
+            if (!hit) return
 
             const next = { ...row }
             const hasCode = String(next.sKodu || '').trim() !== ''
@@ -3508,20 +3512,19 @@ async function fetchBulkItemPrices () {
 
             // Only mark if something changed
             const changed = (next.sKodu !== row.sKodu) || (next.sAciklama !== row.sAciklama) || (next.inputPrice !== row.inputPrice) || (next.inputPricePrBr !== row.inputPricePrBr)
-            if (!changed) return row
+            if (!changed) return
             filled += 1
-            return recalculateDetailRow({
-              ...next,
-              __autoFilledFromPrev: true
-              ,
+            Object.assign(row, next, {
+              __autoFilledFromPrev: true,
               __autoFilledFromPrevSameFirma: Boolean(hit?.is_same_firma || hit?.isSameFirma)
-            }, {
+            })
+            recalculateDetailRow(row, {
               priceType: 'PREV',
               updateState: 'autofill',
               markChanged: true
             })
           })
-        }))
+        })
         triggerUIUpdate()
 
         if (filled > 0) {