rsync not resuming of cdimage site

[Krsnendu dasa]

I want to install jaunty to test out ltsp with it.

I have downloaded alpha 6 and wanted to update it to daily current. When I
run rsync it always tries to download the whole file again. Any ideas why?
When the new download get
to say 30mb and  I stop then then resume, it starts from 30mb as expected.
Why doesn't it just copy the difference between the two versions of the iso?

This is the command I am using.

rsync -zhhP rsync://cdimage.ubuntu.com/cdimage/daily/current/jaunty-alternate-i386.iso
.

I got the idea from this website.

https://help.ubuntu.com/community/RsyncCdImage

It seems a waste to download the whole thing every time.
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