Positive rotation not negative.

src/engine/objects/Mob.java

@@ -920,7 +920,7 @@ public class Mob extends AbstractIntelligenceAgent {
 
             // Rotate slot position by the building rotation
 
-            this.bindLoc = Vector3fImmutable.rotateAroundPoint(building.getLoc(), this.bindLoc, -building.getBounds().getQuaternion().angleY);
+            this.bindLoc = Vector3fImmutable.rotateAroundPoint(building.getLoc(), this.bindLoc, building.getBounds().getQuaternion().angleY);
 
             this.loc = new Vector3fImmutable(bindLoc);
             this.endLoc = new Vector3fImmutable(bindLoc);

src/engine/objects/NPC.java

@@ -364,7 +364,7 @@ public class NPC extends AbstractCharacter {
 
 			// Rotate slot position by the building rotation
 
-			this.bindLoc = Vector3fImmutable.rotateAroundPoint(building.getLoc(), this.bindLoc, -building.getBounds().getQuaternion().angleY);
+			this.bindLoc = Vector3fImmutable.rotateAroundPoint(building.getLoc(), this.bindLoc, building.getBounds().getQuaternion().angleY);
 
 			this.loc = new Vector3fImmutable(bindLoc);