Fix wrong index

src/main/java/com/raoulvdberge/refinedstorage/api/storage/IStorageDisk.java

@@ -13,6 +13,9 @@ public interface IStorageDisk<T> extends IStorage<T> {
      */
     int getCapacity();
 
+    /**
+     * @return whether this storage voids excess stacks
+     */
     boolean isVoiding();
 
     /**

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/diskmanipulator/NetworkNodeDiskManipulator.java

@@ -85,7 +85,7 @@ public class NetworkNodeDiskManipulator extends NetworkNode implements IComparab
             if (FMLCommonHandler.instance().getEffectiveSide() == Side.SERVER) {
                 RSUtils.createStorages(
                     getStackInSlot(slot),
-                    slot,
+                    3 + slot,
                     itemStorages,
                     fluidStorages,
                     s -> new StorageItemDiskManipulator(NetworkNodeDiskManipulator.this, s),