textbox churned line vacant line disappear

i have winform concentration built c# .net 2.0. i have textbox set multiline property.

the problem someone writes calm churned lines (press few enters), presses save button, following closes loads form again, new lines disappear (the calm there during least).

for example, textbox it:

line1

line3

it feeling after i save load:

line1 line3

any thought why?

update

the database postgres i pgadmin i line "enters". attention seem have save line... problem seem i put behind twine textbox.