Issue when upgrading from jQuery version 1.4.4 to 1.8.0

Issue when upgrading from jQuery version 1.4.4 to 1.8.0

Hi All,
In my project there was a reference to jQuery version 1.4.4 which was working fine. Later because we need to use "on" function instead of earlier "live" method I changed the version to 1.8.0. Now, I am able to use "on" function but many of the UI alignment has been disordered. There seems no direct way to find out why this is happening.
Can anyone give clue what may be the reason behind this problem.

Thanks