UI resizable bug?

UI resizable bug?


Greetings.
I'am writing image area selection feature with jQuery 1.3.2 and jQuery
UI 1.7.1 and encountered the next problem.
I used Eyecon Interface library great example and tried to port it to
the jQuery UI, but as you can see there are visible incorrect work of
the simple jQuery UI resizable element.
Donor example: http://interface.eyecon.ro/demos/resize.html During the
North and West resize it works very smooth.
Ported example using jQuery UI 1.7.1: http://www.nenriki.org/Temp/resize.html
As you can see, during the North and West resize image shakes and
offsets to several pixels.
Can you please explain why jQuery UI resizable element behaviour is
not the same?