Padding increase in scrolling

[nvdcmptr]

When i create cslinearlayoutView with scroll property value YES and after that i add some items like

CSLinearLayoutItem *itmFoo=[CSLinearLayoutItem layoutItemForView:foo];
    itmFoo.padding=CSLinearLayoutMakePadding(25, 0, 0, 0);

now problem shown here: when i scroll to bottom the top pad (e.g 25pt in) become increase. why? can i solve it?