arkose changes ownership of user's home directory

On a test system there are 2 users 'j-lallement' and 'ubuntu' with the following membership
$ id j-lallement
uid=1001(j-lallement) gid=1001(j-lallement) groups=1001(j-lallement),4(adm),116(lpadmin),118(admin),124(sambashare),128(libvirtd)
$ id ubuntu
uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu),4(adm),20(dialout),24(cdrom),27(sudo),46(plugdev),116(lpadmin),118(admin),124(sambashare),128(libvirtd)

Note that ubuntu was the first account created on that box.

TEST CASE:
1. login as j-lallement
2 Start arkose with the following command
$ sudo arkose -n -h -c "cd $PWD; $SHELL"

RESULT:
The ownership of /home/j-lallement changed to ubuntu:ubuntu
# ls -l
total 16
drwx------ 173 ubuntu ubuntu 12288 Nov 14 11:47 j-lallement
drwxr-xr-x 31 ubuntu ubuntu 4096 Oct 30 03:23 ubuntu

While it should be
drwx------ 173 j-lallement j-lallement 12288 Nov 14 11:47 j-lallement
drwxr-xr-x 31 ubuntu ubuntu 4096 Oct 30 03:23 ubuntu

Expected result
The ownership shouldn't change

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: arkose 1.4-0ubuntu1
ProcVersionSignature: Ubuntu 3.1.0-2.3-generic 3.1.0
Uname: Linux 3.1.0-2-generic x86_64
ApportVersion: 1.26-0ubuntu1
Architecture: amd64
Date: Mon Nov 14 14:35:53 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: arkose
UpgradeStatus: No upgrade log present (probably fresh install)