Affects Version/s: 1.5.x
Component/s: Portal Layout (deprecated)
Liferay portal 6.1.x
This problem doesn't occur in master because the styles have changed to bootstrap.
Steps to reproduce (with liferay portal 6.1.x):
select 2 columns layout
set column-2 with login portlet
set column-2 with bookmarks portlet
drag & drop bookmarks portlet below login portlet. Drop it 30 px below the end of login portlet
when the mouse button is released, bookmarks portlet is shown on top of column-1
This happens because the calculation of the position is made in relation of the column-1 container.
Due the display css property of the column, column-1 has exactly the same height of column-2. This is the main cause of the behaviour, because the position is processed using the column height.