ram expander bug

hi frds,
i am having a problem with my phone samsung gts 8500 (wave 1) badadroid omni installed.
i had installed ram expander in my phone and swaped it with 2gb sd card, it went sucessfully.
after some days i delete the swap file from my sd card , but when i checked the swap memory through terminal emulator it was not zero.
i wanna know the solution to make it zero. and swap again with 16 gb sd card plz help

thanks in advance. :)