Cryptomatte keeps changing each frame

[CiroCardoso3v]

Ok, so I am rendering with 4 machines, each one is doing 1 frame. And each frame the Cryptomatte is different. I am using Arnold 6 and I can't upgrade to Arnold 7. It seems that the issue is mostly on the Forest Pack, but elements that aren't forest pack also change each frame.

Any idea what is happening?

[CiroCardoso3v]

Same machine doing doing one frame at the time on a render farm, produces different Material and Object Cryptomatte. Would a log help on this? It seems if I just open Max and press render, I don't have this issue???

[Stephen.Blair]

Cryptomatte object? or Material or Asset?

My guess is that the name is changing with every frame.

[CiroCardoso3v]

Asset stays the same. Material and Object change.