Page Jumping | Fields not getting Focussed > Happening in Portlets

This is due to the anchors,
The use of the anchors depends on the configuration of your device, for example your desktop browser. It is controlled by a client device capability called FRAGMENT_IDENTIFIER. When the used device, for example the browser, has this capability enabled, the portal adds an anchor to the portlet URL. You can disable the addition of the anchors by deleting the capability FRAGMENT_IDENTIFIER from the desired clients. You do this under Administration > Portal Settings > Supported Clients.

Read more regarding this here :
http://publib.boulder.ibm.com/infocenter/wpdoc/v510/index.jsp?
topic=/com.ibm.wp.zos.doc/wps/adisancr.html