File Upload Progressbar starts in a filled state

Theme: Icecube
When I want to upload a small file the progressmeter counts down form right to left. When the file size is increased it becomes visible that the progressmeter first goes from right to left and then starts growing form left to right.

This issue can be seen in the fiddle.
http://zkfiddle.org/sample/b3da6i/1-Wrong-Way-to-Customize-Error-Message-on-Big-File-Upload#source-1