I did a couple of quick tests and it looks as though file roller is not
actually compressing the tar file, and it doesn't matter which
compression method is chosen. Not sure why it has this effect on your
files as the command works as expected for other files.

Steps to reproduce:
1) In Nautilus, right click on "backlightx" directory, Compress...
2) Select .tar.bz2
3) Resulting file size is 10.2KB

4) Right click on directory, Compress...
5) Select .tar
6) Resulting file size is 10.2KB

7) Right-click on .tar, Compress...
8) Select .bz2
9) Resulting file is 870KB

** Changed in: file-roller (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1064117

Title:
  Extremly poor compression for .tar.bz2

Status in “file-roller” package in Ubuntu:
  Confirmed

Bug description:
  I am running Xubuntu 12.10 beta 64bit
  i created a archive for a folder 
  the contents are ~1.5kb the archive is over 10kb
  i compressed the same files on my Ubuntu 10.04 install and the archive is 851 
bytes

  archive was created from the create archive option in the right click
  menu in the file browser (thunar)

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