Strange position dot / leaf using paragraph-spacing-before


I try to get some space between main level projects, using the following code:

// Project space before
item[depth=1][data-type=project] {
  paragraph-spacing-before: 30;
  paragraph-spacing-after: 0;
  font-size: @user-font-size + 2;

For the first project, the dot / leave is places correctly, but for the following projects the dot is shifted upwards.Is there a way to get it back on position?