Cd empty after burning !

[Francesco bat]

Hello !
A strange thing happened to me two times.
After i burned a cd in multisession, in the end of cd, i have burned last session to complete but after the burning the cd is empy and the Label is renamed: "CD".
If i control with isobuster it's all right, if i insert my cd in dvd rom it's all right, but my cd writer sees empty cd !
This is happened with two cds when i burn last session where there were remained just the space for that session without to count the other space that deepburner leaves between a session and another !
Why does it happen ?
Bye
Francesco bat