Unfortunately, yes, there are exceptional cases when the certificate you are requesting for cannot be immediately fetched from the PSA's database. Cases like this would go through manual verification by PSA's retrievers who exert every possible effort to retrieve your requested certificate from the PSA's document archives. This usually adds 7 extra days of processing.
There are also cases when the delay happens during delivery such as to areas that enforce hard lockdowns. In this case, we fully comply with the rules and hold delivery attempts until the lockdown is lifted.
Finally, some deliveries might be delayed when the person who requested for the document was not able to receive it at the time of delivery.