Uncontrolled Animation

[krosoftware]

Hello all and happy New Year!
Why is the animation used when navigating between pages (not always, but sometime) or by changing colors, please check image below or watch video: http://www.youtube.com/watch?v=KZ3dldRFJLY
When I click few times on different colors and/or sidebar setting, current page is animated from left to right - again, not always, but 2-3 times of 10.
Why is that, please?
Thank you.