Hi Victor,
Maybe it is a bug. If it is not difficult for you to apply patch for the system, you can try to apply the latest bundle patch.
Also if the problem does till occur after applying the latest bundle patch, I think you can raise a ticket to SAP or oracle to get the root cause of this issue. Do you have the account?
Because usually SAP customer should strictly follow the note 1171650 and 1888485 for the parameters. If the root cause is not addressed, I am afraid the situation may get worse and worse by adjusting parameters.
Best regards,
James