diff --git a/src/main/java/noppes/npcs/client/gui/util/GuiNPCInterface.java b/src/main/java/noppes/npcs/client/gui/util/GuiNPCInterface.java
index 08a5dff00..24d08cff2 100644
--- a/src/main/java/noppes/npcs/client/gui/util/GuiNPCInterface.java
+++ b/src/main/java/noppes/npcs/client/gui/util/GuiNPCInterface.java
@@ -515,15 +515,28 @@ public abstract class GuiNPCInterface extends GuiScreen {
         }
 
         boolean subGui = hasSubGui();
+
+        // Mouse.getDWheel() clears the accumulated delta, so only the first caller in a frame
+        // ever sees it. Read it once here and let each widget take it in turn; anything that
+        // consumes it zeroes it so later widgets - the script editor, for one - are not left
+        // reading an already-drained wheel.
+        mouseScroll = Mouse.getDWheel();
+
         drawCenteredString(fontRendererObj, title, width / 2, guiTop + 4, 0xffffff);
         for (GuiNpcLabel label : labels.values())
             label.drawLabel(this, fontRendererObj);
         for (GuiCustomScroll scroll : scrolls.values()) {
             scroll.updateSubGUI(subGui);
-            scroll.drawScreen(drawX, drawY, f, !subGui && scroll.isMouseOver(drawX, drawY) ? Mouse.getDWheel() : 0);
+            int delta = !subGui && scroll.isMouseOver(drawX, drawY) ? mouseScroll : 0;
+            if (delta != 0)
+                mouseScroll = 0;
+            scroll.drawScreen(drawX, drawY, f, delta);
         }
         for (GuiScrollWindow guiScrollableComponent : scrollWindows.values()) {
-            guiScrollableComponent.drawScreen(drawX, drawY, f, !subGui && guiScrollableComponent.isMouseOver(drawX, drawY) ? Mouse.getDWheel() : 0);
+            int delta = !subGui && guiScrollableComponent.isMouseOver(drawX, drawY) ? mouseScroll : 0;
+            if (delta != 0)
+                mouseScroll = 0;
+            guiScrollableComponent.drawScreen(drawX, drawY, f, delta);
         }
         for (GuiDiagram diagram : diagrams.values()) {
             diagram.drawDiagram(drawX, drawY, subGui);
diff --git a/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea.java b/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea.java
index 647621117..70283b7e0 100644
--- a/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea.java
+++ b/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea.java
@@ -624,9 +624,11 @@ public class GuiScriptTextArea extends GuiNpcTextField {
         int maxScroll = Math.max(0, getPaddedLineCount() - container.visibleLines);
 
         // Handle mouse wheel scroll
-        int wheelDelta = ((GuiNPCInterface) listener).mouseScroll = Mouse.getDWheel();
+        // Take whatever the parent screen has left for this frame rather than polling the wheel
+        // again - the poll is destructive and the parent has already drained it.
+        int wheelDelta = listener instanceof GuiNPCInterface ? ((GuiNPCInterface) listener).mouseScroll : Mouse.getDWheel();
         if (listener instanceof GuiNPCInterface) {
-            ((GuiNPCInterface) listener).mouseScroll = wheelDelta;
+            ((GuiNPCInterface) listener).mouseScroll = 0;
 
             // Intercept wheel scroll for tooltip (highest priority)
             // Only consume the wheel event when the tooltip actually has content to scroll;
diff --git a/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea1.java b/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea1.java
index 60e5a38a0..a5a555514 100644
--- a/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea1.java
+++ b/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea1.java
@@ -486,9 +486,11 @@ public class GuiScriptTextArea1 extends GuiNpcTextField {
         int maxScroll = Math.max(0, getPaddedLineCount() - container.visibleLines);
 
         // Handle mouse wheel scroll
-        int wheelDelta = ((GuiNPCInterface) listener).mouseScroll = Mouse.getDWheel();
+        // Take whatever the parent screen has left for this frame rather than polling the wheel
+        // again - the poll is destructive and the parent has already drained it.
+        int wheelDelta = listener instanceof GuiNPCInterface ? ((GuiNPCInterface) listener).mouseScroll : Mouse.getDWheel();
         if (listener instanceof GuiNPCInterface) {
-            ((GuiNPCInterface) listener).mouseScroll = wheelDelta;
+            ((GuiNPCInterface) listener).mouseScroll = 0;
             boolean canScroll = !KEYS_OVERLAY.isVisible() || KEYS_OVERLAY.isVisible() && !KEYS_OVERLAY.aboveOverlay;
             if (wheelDelta != 0 && canScroll) 
                 scroll.applyWheelScroll(wheelDelta, maxScroll);