diff --git a/components/BSRUnitsCorrelationChart.tsx b/components/BSRUnitsCorrelationChart.tsx
index ddcc643..d047e25 100644
--- a/components/BSRUnitsCorrelationChart.tsx
+++ b/components/BSRUnitsCorrelationChart.tsx
@@ -75,15 +75,18 @@ export const BSRUnitsCorrelationChart: React.FC<Props> = ({ bsrData, combinedSal
   }, [combinedSalesData]);
 
   // Per-market chart data: BSR avg + units sum aligned by week
-  const { chartData, pearsonCorrelation } = useMemo(() => {
+  const { chartData, pearsonCorrelation, debugInfo } = useMemo(() => {
     // BSR: average detailLevelBSR per week (falls back to topLevelBSR if detail is unavailable)
+    // Coerce week to number to guard against string values at runtime
     const bsrByWeek = new Map<number, { sum: number; count: number }>();
-    bsrData
-      .filter(r => r.market === resolvedMarket && (r.detailLevelBSR != null || r.topLevelBSR != null))
+    const bsrRecordsForMarket = bsrData.filter(r => r.market === resolvedMarket);
+    bsrRecordsForMarket
+      .filter(r => r.detailLevelBSR != null || r.topLevelBSR != null)
       .forEach(r => {
         const bsr = r.detailLevelBSR ?? r.topLevelBSR!;
-        const e = bsrByWeek.get(r.week) ?? { sum: 0, count: 0 };
-        bsrByWeek.set(r.week, { sum: e.sum + bsr, count: e.count + 1 });
+        const week = Number(r.week);
+        const e = bsrByWeek.get(week) ?? { sum: 0, count: 0 };
+        bsrByWeek.set(week, { sum: e.sum + bsr, count: e.count + 1 });
       });
 
     // Units: sum unitsTotal per week for current year
@@ -91,9 +94,18 @@ export const BSRUnitsCorrelationChart: React.FC<Props> = ({ bsrData, combinedSal
     combinedSalesData
       .filter(r => r.customer === resolvedMarket && r.year === currentYear && r.week)
       .forEach(r => {
-        unitsByWeek.set(r.week, (unitsByWeek.get(r.week) ?? 0) + r.unitsTotal);
+        const week = Number(r.week);
+        unitsByWeek.set(week, (unitsByWeek.get(week) ?? 0) + r.unitsTotal);
       });
 
+    const debugInfo = {
+      bsrTotal: bsrData.length,
+      bsrForMarket: bsrRecordsForMarket.length,
+      bsrWithValues: bsrByWeek.size,
+      unitsWeeks: unitsByWeek.size,
+      uniqueMarkets: Array.from(new Set(bsrData.map(r => r.market))).join(', '),
+    };
+
     const allWeeks = Array.from(
       new Set([...bsrByWeek.keys(), ...unitsByWeek.keys()])
     ).sort((a, b) => a - b);
@@ -115,7 +127,7 @@ export const BSRUnitsCorrelationChart: React.FC<Props> = ({ bsrData, combinedSal
       paired.map(d => d.units as number)
     );
 
-    return { chartData, pearsonCorrelation: r };
+    return { chartData, pearsonCorrelation: r, debugInfo };
   }, [resolvedMarket, bsrData, combinedSalesData, currentYear]);
 
   const config = MARKET_CONFIG[resolvedMarket] ?? { label: '?', color: '#94a3b8', flag: '🌍' };
@@ -324,6 +336,13 @@ export const BSRUnitsCorrelationChart: React.FC<Props> = ({ bsrData, combinedSal
         </span>
       </div>
 
+      {/* Temporary debug strip — remove once BSR line is confirmed working */}
+      <div className="px-3 py-2 rounded-lg bg-slate-900/60 border border-slate-800 text-[10px] font-mono text-slate-500 space-y-0.5">
+        <div>BSR records total: <span className="text-slate-300">{debugInfo.bsrTotal}</span> · for {resolvedMarket}: <span className="text-slate-300">{debugInfo.bsrForMarket}</span> · with values: <span className="text-slate-300">{debugInfo.bsrWithValues} weeks</span></div>
+        <div>Units weeks found: <span className="text-slate-300">{debugInfo.unitsWeeks}</span> · year: <span className="text-slate-300">{currentYear}</span></div>
+        <div>Markets in BSR data: <span className="text-slate-300">{debugInfo.uniqueMarkets || '(none)'}</span></div>
+      </div>
+
     </div>
   );
 };