Post to Ledger is yes in subledger, but still the journals were not posted in GL

Hi,

We have scheduled create accounting cost management program years back, in which post to ledger parameter is set to YES and journals were posted into GL. But recently for October period for 20 days journals were pushed to GL, but not posted. But for the remaining days the journals were posted. Do not understand the reason. We have checked the scheduled program parameters and whether there is any manual intervention, but both are fine. We posted those unposted journals manually. Want to know why these specific date journals were in unposted status with scheduled