weird cd layout

I tried to burn a NRG CD image file but the burning process seems to quit after the first few sectors. So instead of using Nero 6, Nero 5 seem to be able to read the image but here is the problem.

If I burn the image in Nero 5 and view the track later (attch pic #1), it shows it's a multi-session CD, and the first session is a mp4 audio file, the second session is a ISO image.

If I open the burned CD from above in ISOBuster, like in attached pic #2 and #3, it also shows multi-session, and was able to see files in the 2nd track.

The original nrg image cannot be opened by DVD Decrypter, it says invalid image file. I tried to extract the 2nd track only and burn into CD but didn't work on PS2, it recognized as a PS2 disk but won't load.

Is there something wrong with the image?

Open disc in ISOBuster:

Is PS2 disc a single track or multi-session?