WebView below Android 4.4

Hi all,

Recently i have been working on an android hybrid app. To show the existing mobile website in side a web-view.
When i do so the website works fine in the emulator. Page scrolling,popup scrolling,menu slider show/hide all functions work perfectly.

But when i install the app on devices running Android version less than 4.4 all those functionality are not working.
Menu slider closes but the design renders still in the screen.
Popup does not scroll up until the page behind it scrolls to an height

Could some one tell me a solution to this.

I have tried using all the webviewclient functions.
javascriptenabled, domstoratge,clearhistory,,useragentstring,webchromeclient,....etc

But nothing seems to work.

I need to know when the site is working fine in emulator-WebView and chrome browser why is it not working in the mobile alone