app/Filament/Widgets/ItemOverview.php

@@ -186,10 +186,8 @@ class ItemOverview extends ChartWidget
             $weeklyPlanQuantity = \DB::table('production_plans')
                 ->where('plant_id', $selectedPlant)
                 ->where('line_id', $selectedLine)
-                ->whereBetween('created_at', [
-                    $startDate,
-                    $endDate
-                ])
+                ->whereYear('created_at', $startDate->year)
+                ->whereMonth('created_at', $startDate->month)
                 ->sum('plan_quantity');
 
             $daysCount = count($orderedData);