When the user focuses on a textfield, causing the virtual keyboard to pop-up, and the user subsequently scrolls down the screen while the virtual keyboard is open, and finally, the user closes the virtual keyboard, the controls on the screen lose their click position. After this occurs, in order to click a control such as a texbox, dropdown box, or button, the user needs to click further down the page and not where the control is actually situated. Also, it is not possible to scroll back up to the top of the page once this occurs."
As seen started in the Blackberry Dev Support Forums: http://supportforums.blackberry.com/t5/Web-and-WebWorks-Development/WebWorks-Controls-lose-position-after-virtual-keyboard-pops-ups/m-p/1732315
To quote the original post: