It may not be as bad as it seems. In some cases, major repairs are done in advance of the reserve study requirements, meaning the reserve fund is depleted ahead of schedule but that major repair is done and won't require the funds at the scheduled time.
For example: a $200k roof replacement may be scheduled for 2020 but was done last fall. This would make the reserve fund look as though it was $200k short when compared to the reserve plan.
That being said, it is likely the auditor would have caught that, so Alvaro's suggestion is probably applicable. The cause of the shortfall must be found and rectified, if required.