Hi Zeeshan. Yes, I think this is a good place to post this question. I've also observed this disparity, but have just attributed it to the extract. When it's published to server, it may be in an uncompressed format, but when you download it, it may be compressed.
Thanks for getting back to me Jeff.
It makes sense to attribute this disparity with extract being uncompressed and compressed between desktop and server however in my case the packaged workbook is packaged because of embedded images and the data extracts it is using are all published on the server. Let's see if we get more insight on this.