diff --git a/ui/src/views/Forecast.jsx b/ui/src/views/Forecast.jsx
index ce4a1d0..3e73393 100644
--- a/ui/src/views/Forecast.jsx
+++ b/ui/src/views/Forecast.jsx
@@ -1237,16 +1237,19 @@ export default function Forecast({ sources = [], sourceId, versions = [], versio
     table.addStyleListener(() => {
       // The grand-total row, hidden on request. The engine has no rollup mode
       // for "subtotals but no grand total" -- rollup, flat and total are the
-      // three -- so it is dropped here instead. It is view row 0 with a row
-      // header blank at every level; y alone is not enough, since under flat
-      // rollup there is no total and row 0 is a leaf. Tagged per draw, because
-      // the grid recycles its tr elements as it scrolls.
+      // three -- so it is dropped here instead. It is view row 0, whose row
+      // header the datagrid fills with a label object reading "TOTAL" and
+      // blanks below it -- not blank throughout, which is what this first
+      // assumed. y alone is not enough, since under flat rollup there is no
+      // total and row 0 is a leaf. Tagged per draw, because the grid recycles
+      // its tr elements as it scrolls.
       for (const tr of table.querySelectorAll('tbody tr')) {
         const th = tr.querySelector('th')
         let meta
         try { meta = th ? table.getMeta(th) : null } catch { meta = null }
-        const isTotal = meta?.y === 0 && Array.isArray(meta.row_header) &&
-                        !meta.row_header.some(notBlank)
+        const head = meta?.row_header
+        const isTotal = meta?.y === 0 && Array.isArray(head) &&
+                        String(head[0]) === 'TOTAL' && !head.slice(1).some(notBlank)
         tr.classList.toggle('pf-total-row', isTotal && !showTotalRowRef.current)
       }