LinuxQuestions.org - Discrepancy measuring files with du

I'm having trouble understanding whats happening with du. I measured disk usage of /home/joe/ and got this:

Code:

root@Squeeze:/mnt/backup/squeeze/backup.0/home# du -hsc ./*

229M    ./backup

18G    ./joe

18G    total

and when I measured inside /joe/ I got this:

Code:

root@Squeeze:/mnt/backup/squeeze/backup.0/home/joe# du -hsc ./*

76K    ./282420-Question-about-sharpening-technique.html

108K    ./449862-Razor-Edge-Book-of-Sharpening.html

104K    ./79287-problems-beginning-honer-2.html

60K    ./81240-need-advice-sharpening-razor.html

116K    ./81241-making-lather-mama-bears-soap-2.html

96K    ./81241-making-lather-mama-bears-soap-3.html

108K    ./81241-making-lather-mama-bears-soap.html

96K    ./advantage-70-30-bevel.html

76K    ./angle-for-steeling-1.html

36K    ./angle-for-steeling-2.html

11G    ./audio

247M    ./bin

56K    ./burning-youtube-videos-dvd.html

48K    ./Buying-Straight-Razors-On-Ebay_W0QQugidZ10000000001450975.html

4.0K    ./dead.letter

3.1M    ./Desktop

662M    ./documents

28K    ./edge-probing-and-assessment.html

4.0K    ./edge-thickness.txt

0      ./Firefox

332K    ./haiti

72K    ./Honing.html

96K    ./how-much-resistance-correct.html

4.0K    ./iceweasel-trouble.txt

4.0K    ./jre.txt

16K    ./links

4.0K    ./majorBurnz.txt

8.0K    ./mbox

4.0K    ./md5.txt

4.0K    ./modine.txt

112K    ./need help-setting-bevel.html

676K    ./need-help-with-chromium-browser_files

104K    ./need-help-with-chromium-browser.html

100K    ./Pressure to set bevel .html

60K    ./question-about-magnifiers-2.html

148K    ./question-about-magnifiers.html

40K    ./receipts.doc

728K    ./resumes

60K    ./sharpening-single-bevel-or-asymmetrical.html

68K    ./sharpen-razor-razorandstone.html

4.0K    ./sharpness-grit-levels.txt

20K    ./sharpness_review.html

12K    ./sharpness-tests.txt

20K    ./tape-usually-bad-for-razors.html

36K    ./taping-the-spine-new-light-Jende-Industries.html

32K    ./time.html

980K    ./transfer

2.6G    ./video

14G    total

Why does one give me 4G more when I'm measuring the same files?

Thanks