diff --git a/swad_changelog.h b/swad_changelog.h
index ad21683b4..394308cc9 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -632,10 +632,11 @@ TODO: Francisco Javier Fern
 Me sale este error, no sé si por no recordar yo la sintaxis apropiada para mandar a varios destinatarios. ¿No era así?
 "can npt create received message (duplicated entry '243218-2160773' for key 'UsrCod_MsgCod')
 */
-#define Log_PLATFORM_VERSION	"SWAD 23.17 (2023-09-25)"
+#define Log_PLATFORM_VERSION	"SWAD 23.17.1 (2023-09-25)"
 #define CSS_FILE		"swad23.16.1.css"
 #define JS_FILE			"swad22.49.js"
 /*
+	Version 23.17.1:  Sep 25, 2023  Fixed bug in hierarchy. (336654 lines)
 	Version 23.17:	  Sep 25, 2023  Code refactoring in hierarchy. (336655 lines)
 	Version 23.16.1:  Sep 25, 2023  Fixed CSS issues. (336778 lines)
 	Version 23.16:	  Sep 22, 2023  Code refactoring in hierarchy and cache. (336775 lines)
diff --git a/swad_hierarchy.c b/swad_hierarchy.c
index 3d8162858..b40967553 100644
--- a/swad_hierarchy.c
+++ b/swad_hierarchy.c
@@ -1077,20 +1077,18 @@ static void Hie_GetAndShowHierarchyWith (Hie_Level_t LevelGrandChildren)
    Hie_Level_t LevelChildren;
 
    /***** Get number of elements with courses *****/
+   // For each level country, institution, center, degree and course...
    for (LevelChildren  = Hie_CTY;
         LevelChildren <= Hie_CRS;
         LevelChildren++)
-      if (LevelChildren < LevelGrandChildren)
-        {
-	 if (LevelChildren <= Gbl.Scope.Current)
-	    NumNodes[LevelChildren] = 1;
-	 else	// Level >= Gbl.Scope.Curremt + 1
-            NumNodes[LevelChildren] = (int) Hie_GetCachedNumNodesInHieLvlWith (LevelChildren,		// Child
-        							               Gbl.Scope.Current,	// Parent
-        							               LevelGrandChildren);	// Grand child
-        }
-      else	// Level >= LevelGrandChildren
+      if (LevelChildren >= LevelGrandChildren)		// Example: don't show number of centers with institutions
 	 NumNodes[LevelChildren] = -1;
+      else if (LevelChildren < Gbl.Scope.Current)	// Example: if scope is center (4) =>
+	 NumNodes[LevelChildren] = 1;			//          number of countries/instit./centers in center is 1
+      else
+         NumNodes[LevelChildren] = (int) Hie_GetCachedNumNodesInHieLvlWith (LevelChildren,		// Child
+        							            Gbl.Scope.Current,	// Parent
+        							            LevelGrandChildren);// Grand child
 
    /***** Write number of elements with courses *****/
    Hie_ShowHierarchyRow (Txt_With_,*Txt[LevelGrandChildren],"DAT",NumNodes);
@@ -1218,7 +1216,7 @@ unsigned Hie_GetCachedNumNodesInHieLvlWith (Hie_Level_t LevelChildren,
   {
    static FigCch_FigureCached_t Figure[Hie_NUM_LEVELS][Hie_NUM_LEVELS] =
      {
-     // Child Grandchild
+     // Child / Grandchild
       [Hie_CTY][Hie_INS] = FigCch_NUM_CTYS_WITH_INSS,
       [Hie_CTY][Hie_CTR] = FigCch_NUM_CTYS_WITH_CTRS,
       [Hie_CTY][Hie_DEG] = FigCch_NUM_CTYS_WITH_DEGS,
@@ -1235,7 +1233,7 @@ unsigned Hie_GetCachedNumNodesInHieLvlWith (Hie_Level_t LevelChildren,
      };
    static unsigned (*FunctionGetFigure[Hie_NUM_LEVELS][Hie_NUM_LEVELS]) (Hie_Level_t Level,long HieCod) =
      {
-     // Child Grandchild
+     // Child / Grandchild
       [Hie_CTY][Hie_INS] = Cty_DB_GetNumCtysWithInss,
       [Hie_CTY][Hie_CTR] = Cty_DB_GetNumCtysWithCtrs,
       [Hie_CTY][Hie_DEG] = Cty_DB_GetNumCtysWithDegs,
diff --git a/swad_hierarchy_database.c b/swad_hierarchy_database.c
index 2023d76ca..1d9c7667b 100644
--- a/swad_hierarchy_database.c
+++ b/swad_hierarchy_database.c
@@ -38,13 +38,13 @@ void Hie_DB_BuildSubquery (char SubQuery[128],Hie_Level_t Level,long HieCod)
   {
    static const char *Format[Hie_NUM_LEVELS] =
      {
-      [Hie_UNK] = "",				// Unknown
-      [Hie_SYS] = "",				// System
+      [Hie_UNK] = "",					// Unknown
+      [Hie_SYS] = "",					// System
       [Hie_CTY] = "ins_instits.CtyCod=%ld AND ",	// Country
       [Hie_INS] = "ctr_centers.InsCod=%ld AND ",	// Institution
       [Hie_CTR] = "deg_degrees.CtrCod=%ld AND ",	// Center
       [Hie_DEG] = "crs_courses.DegCod=%ld AND ",	// Degree
-      [Hie_CRS] = "crs_users.CrsCod=%ld AND ",	// Course
+      [Hie_CRS] = "crs_users.CrsCod=%ld AND ",		// Course
      };
 
    if (HieCod > 0)