The dvd is empty after cloning



hi all,
I have a interesting problem. I use clonedvd2 and anydvd on xp. I copied a dvd movie successfully but after finishing the copying process copy dvd seems to be empty. on different machine, the copy dvd is normally but on the computer which has dvdwriter this dvd is empty.

The original dvd is not mine. But in this situation, I can not copy from the clone dvd.

any suggest?