diff --git a/src/scenes/ShipDeckScene.js b/src/scenes/ShipDeckScene.js
index a90f684..31cc0be 100644
--- a/src/scenes/ShipDeckScene.js
+++ b/src/scenes/ShipDeckScene.js
@@ -115,7 +115,6 @@ export default class ShipDeckScene extends Phaser.Scene {
         // Calculate group dimensions
         const groupWidth = (Math.min(barrelCount, barrelsPerRow) * horizontalSpacing);
         const stackLevels = Math.ceil(barrelCount / barrelsPerRow);
-        const groupHeight = (stackLevels * barrelHeight) + ((stackLevels - 1) * (verticalSpacing - barrelHeight));
 
         // Center horizontally in left half of deck
         const leftHalfCenter = this.deckLeftX + (this.deckWidth / 4);
@@ -123,7 +122,12 @@ export default class ShipDeckScene extends Phaser.Scene {
 
         // Center vertically on deck (using actual deck edges)
         const deckVerticalCenter = (this.deckTopEdge + this.deckBottomEdge) / 2;
-        const baseY = deckVerticalCenter + (groupHeight / 2);
+        // Calculate where bottom barrel should be so group is centered
+        // Top of group = baseY - (stackLevels-1)*verticalSpacing - barrelHeight/2
+        // Bottom of group = baseY + barrelHeight/2
+        // Center of group = (top + bottom) / 2 = baseY - ((stackLevels-1)*verticalSpacing)/2
+        // We want: baseY - ((stackLevels-1)*verticalSpacing)/2 = deckVerticalCenter
+        const baseY = deckVerticalCenter + ((stackLevels - 1) * verticalSpacing) / 2;
 
         // Create barrels in stacking pattern
         for (let i = 0; i < barrelCount; i++) {
@@ -191,7 +195,6 @@ export default class ShipDeckScene extends Phaser.Scene {
         // Calculate group dimensions
         const groupWidth = (Math.min(barrelCount, barrelsPerRow) * horizontalSpacing);
         const stackLevels = Math.ceil(barrelCount / barrelsPerRow);
-        const groupHeight = (stackLevels * barrelHeight) + ((stackLevels - 1) * (verticalSpacing - barrelHeight));
 
         // Center horizontally in right half of deck
         const rightHalfCenter = this.deckCenterX + (this.deckWidth / 4);
@@ -199,7 +202,8 @@ export default class ShipDeckScene extends Phaser.Scene {
 
         // Center vertically on deck (using actual deck edges)
         const deckVerticalCenter = (this.deckTopEdge + this.deckBottomEdge) / 2;
-        const baseY = deckVerticalCenter + (groupHeight / 2);
+        // Calculate where bottom barrel should be so group is centered
+        const baseY = deckVerticalCenter + ((stackLevels - 1) * verticalSpacing) / 2;
 
         // Create barrels in stacking pattern
         for (let i = 0; i < barrelCount; i++) {