I update my webmin installation and since then it shows my real memory as give below,
Real memory 8589934592 TB total, 455 MB used
This is totally wrong, since my Real Memory[RAM] is 1024 MB and vSwap is 1024 MB only. It doesn't recognise vSwap as Virtual Memory and doesn't display that which it used to, since the update.
Another bug would be that if change my hostname from webmin, it changes succesfully there, but changes are implemented over my VPS and in ssh if I run hostname command, my previous hostname is displayed.