diff --git a/dashboard.php b/dashboard.php
index 5c67ba2..614fe3c 100755
--- a/dashboard.php
+++ b/dashboard.php
@@ -597,21 +597,27 @@ switch ($page) {
             $waterDebtors = Report::getWaterDebtors($filters);
         } elseif ($reportType == 'concept-debtors') {
             // Procesar filtros de casas y conceptos
-            $houseFilters = $_GET['filter_houses'] ?? ['all'];
-            $conceptFilters = $_GET['filter_concepts'] ?? ['all'];
+            $houseFilters = $_GET['filter_houses'] ?? [];
+            $conceptFilters = $_GET['filter_concepts'] ?? [];
 
             // Determinar casas a filtrar
-            if (in_array('all', $houseFilters) || empty($houseFilters)) {
+            if (empty($houseFilters) || in_array('all', $houseFilters)) {
                 $filteredHouses = $accessibleHouseIds;
             } else {
-                $filteredHouses = array_intersect($houseFilters, $accessibleHouseIds);
+                // Filtrar solo las casas específicamente seleccionadas
+                $filteredHouses = array_filter($houseFilters, function($houseId) use ($accessibleHouseIds) {
+                    return $houseId !== 'all' && in_array($houseId, $accessibleHouseIds);
+                });
             }
 
             // Determinar conceptos a filtrar
-            if (in_array('all', $conceptFilters) || empty($conceptFilters)) {
+            if (empty($conceptFilters) || in_array('all', $conceptFilters)) {
                 $filteredConcepts = null; // Todos los conceptos
             } else {
-                $filteredConcepts = $conceptFilters;
+                // Filtrar solo los conceptos específicamente seleccionados
+                $filteredConcepts = array_filter($conceptFilters, function($conceptId) {
+                    return $conceptId !== 'all';
+                });
             }
 
             $conceptDebtors = Report::getConceptDebtorsFiltered($filteredHouses, $filteredConcepts);
@@ -916,24 +922,39 @@ switch ($page) {
                             require_once __DIR__ . '/models/Report.php';
 
                             // Procesar filtros para exportación
-                            $houseFilters = $_GET['filter_houses'] ?? ['all'];
-                            $conceptFilters = $_GET['filter_concepts'] ?? ['all'];
+                            $houseFilters = $_GET['filter_houses'] ?? [];
+                            $conceptFilters = $_GET['filter_concepts'] ?? [];
+
+                            // Debug: mostrar qué filtros se están recibiendo
+                            error_log("DEBUG - House filters: " . print_r($houseFilters, true));
+                            error_log("DEBUG - Concept filters: " . print_r($conceptFilters, true));
 
                             // Determinar casas a filtrar para exportación
-                            if (in_array('all', $houseFilters) || empty($houseFilters)) {
+                            if (empty($houseFilters) || in_array('all', $houseFilters)) {
                                 $filteredHouses = $accessibleHouseIds;
+                                error_log("DEBUG - Using all accessible houses: " . count($filteredHouses));
                             } else {
-                                $filteredHouses = array_intersect($houseFilters, $accessibleHouseIds);
+                                // Filtrar solo las casas específicamente seleccionadas
+                                $filteredHouses = array_filter($houseFilters, function($houseId) use ($accessibleHouseIds) {
+                                    return $houseId !== 'all' && in_array($houseId, $accessibleHouseIds);
+                                });
+                                error_log("DEBUG - Using filtered houses: " . count($filteredHouses) . " - " . implode(',', $filteredHouses));
                             }
 
                             // Determinar conceptos a filtrar para exportación
-                            if (in_array('all', $conceptFilters) || empty($conceptFilters)) {
+                            if (empty($conceptFilters) || in_array('all', $conceptFilters)) {
                                 $filteredConcepts = null; // Todos los conceptos
+                                error_log("DEBUG - Using all concepts");
                             } else {
-                                $filteredConcepts = $conceptFilters;
+                                // Filtrar solo los conceptos específicamente seleccionados
+                                $filteredConcepts = array_filter($conceptFilters, function($conceptId) {
+                                    return $conceptId !== 'all';
+                                });
+                                error_log("DEBUG - Using filtered concepts: " . count($filteredConcepts) . " - " . implode(',', $filteredConcepts));
                             }
 
                             $conceptDebtors = Report::getConceptDebtorsFiltered($filteredHouses, $filteredConcepts);
+                            error_log("DEBUG - Concept debtors result: " . count($conceptDebtors['debtors']) . " concepts with debts");
                             include __DIR__ . '/views/reports/pdf_concept_debtors.php';
                             break;
                         case 'expenses':
diff --git a/models/Report.php b/models/Report.php
index 5a6657e..5e8679e 100755
--- a/models/Report.php
+++ b/models/Report.php
@@ -527,8 +527,16 @@ class Report {
             ORDER BY cc.name, h.number, cc.concept_date DESC
         ";
 
+        error_log("DEBUG - SQL Query: " . $query);
+        error_log("DEBUG - SQL Params: " . print_r($params, true));
+
         $results = $db->fetchAll($query, $params);
 
+        error_log("DEBUG - SQL Results count: " . count($results));
+        if (count($results) > 0) {
+            error_log("DEBUG - First result sample: " . print_r($results[0], true));
+        }
+
         // Group by concept like the original method
         $debtors = [];
         $grandTotal = 0;