Mass Dunning by Collection Strategy: Accounts being bypassed?

Hello Colleagues,

We're system testing using Mass Dunning by Collection Strategy.

Approximately 10-15% of the Contract Accounts are not being Dunned. These Accounts are not triggering Steps associated with Capacity Balancing.

Has anyone else encountered this situation? Is there a Buffering setting that needs to be tweaked?

Any feedback will be really appreciated.

Thanks in advance.

Regards,

Ivor