flying objects css at edit an item at Sharepoint 2010 become out of place

Whenever I go to the back-end to edit an item at SharePoint 2010, normally I can mouse-over and I am able to see the arrow. However the arrow seems to be out of place.

I made my mater page to custom master page and default master page setting.

Fix for this as follows

By default, SharePoint use the style class .s4-ctx to control the menu position, It uses inline “absolute” positioning to show the correct Icon “position: absolute”

so add the following code in your custom css

/* fix scrolling on list pages */

#s4-bodyContainer
{
position:relative;
}