diff --git a/PKHeX.Core/Editing/NatureAmp.cs b/PKHeX.Core/Editing/NatureAmp.cs
index 5291b6f9d..b11d68e1f 100644
--- a/PKHeX.Core/Editing/NatureAmp.cs
+++ b/PKHeX.Core/Editing/NatureAmp.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using static PKHeX.Core.NatureAmpRequest;
 
 namespace PKHeX.Core;
@@ -25,7 +25,7 @@ public static int GetNewNature(this NatureAmpRequest type, int statIndex, int cu
         return GetNewNature(type, statIndex, up, dn);
     }
 
-    /// <inheritdoc cref="GetNewNature(PKHeX.Core.NatureAmpRequest,int,int)"/>
+    /// <inheritdoc cref="GetNewNature(NatureAmpRequest,int,int)"/>
     public static int GetNewNature(NatureAmpRequest type, int statIndex, int up, int dn)
     {
         // 
@@ -65,8 +65,8 @@ public static int CreateNatureFromAmps(int up, int dn)
     /// </summary>
     public static (int up, int dn) GetNatureModification(int nature)
     {
-        var up = (nature / 5) + 1;
-        var dn = (nature % 5) + 1;
+        var up = (nature / 5);
+        var dn = (nature % 5);
         return (up, dn);
     }
 
@@ -99,8 +99,8 @@ public static void ModifyStatsForNature(Span<ushort> stats, int nature)
         var (up, dn) = GetNatureModification(nature);
         if (IsNeutralOrInvalid(nature, up, dn))
             return;
-        stats[up] *= 11; stats[up] /= 10;
-        stats[dn] *= 9;  stats[dn] /= 10;
+        stats[up + 1] *= 11; stats[up + 1] /= 10;
+        stats[dn + 1] *= 9;  stats[dn + 1] /= 10;
     }
 }
 
diff --git a/PKHeX.WinForms/Controls/PKM Editor/StatEditor.cs b/PKHeX.WinForms/Controls/PKM Editor/StatEditor.cs
index 074c1731f..24b41b4a6 100644
--- a/PKHeX.WinForms/Controls/PKM Editor/StatEditor.cs	
+++ b/PKHeX.WinForms/Controls/PKM Editor/StatEditor.cs	
@@ -481,8 +481,8 @@ public string UpdateNatureModification(int nature)
         if (NatureAmp.IsNeutralOrInvalid(nature, up, dn))
             return "-/-";
 
-        var incr = L_Stats[up];
-        var decr = L_Stats[dn];
+        var incr = L_Stats[up + 1];
+        var decr = L_Stats[dn + 1];
         incr.ForeColor = StatIncreased;
         decr.ForeColor = StatDecreased;
         return $"+{incr.Text} / -{decr.Text}".Replace(":", "");