Sounds like the system is still in a failure mode, and whilst flights are operating normally,the system itself is running in contingency mode.
Statement from the Irish Aviation Authority: 08:10 – October 3
The IAA continues to investigate the technical issue which occurred in Shannon Airport last evening. Services to and from Shannon and Cork are operating normally on the IAA’s Shannon back-up system.
The IAA’s Dublin system was unaffected and Dublin flights are operating normally. The Dublin system is independent of the Shannon system.
https://www.iaa.ie/news/2018/10/03/s...8-10-october-3