Shell script calling shell script yields odd results

Hello,

I've been banging my head against the wall trying to figure out how to fix an issue. Any help would be appreciated!

What's happening:

I have a server build script that does stuff like install/configure Nginx, Node.js, etc. When installing Node.js, the build script actually calls another shell script.

#Server build script excerpt
#Node.js
if $nodejs_enabled ; then
    sh $server/installNodejs.sh $nodejs_version
fi

Interestingly, I get different results when the server build script calls the Node.js install script, and when I call the Node.js install script myself.

When the server build script calls it, the Node.js directory isn't copied correctly. Instead of copying the entire Node.js folder into /usr/bin/local/, it copies all of the directories within the Node.js folder there. So if you were to run "ls /usr/bin/local/" you would see "bin, etc" instead of "node-v0.12.2-linux-x64".

When I run the Node.js install script myself, it works fine though.

#installNodejs.sh

#!/bin/sh

#Make sure version isn't blank
if [ "$1" = "" ] ; then
    echo "Usage: installNodejs.sh version"
    echo "Example: installNodejs.sh 0.12.2"
    exit
fi

dir="node-v$1-linux-x64"
gz="$dir.tar.gz"
symlink='/usr/local/node'

#Download Node.js binary
wget http://nodejs.org/dist/v$1/$gz

#Extract it
tar -zxf $gz

#Move it to /usr/bin/local/
sudo mv $dir/ /usr/bin/local/

#Remove old symlink
sudo rm $symlink

#Create new symlink
sudo ln -s /usr/bin/local/$dir/bin/node $symlink

I've tried:

-Removing the trailing slash

-Using cp instead of mv

-Running mv with the -v (verbose) flag. That yielded: ‘node-v0.12.2-linux-x64/’ -> ‘/usr/bin/local/’

Any ideas what might be the issue?