There are several areas of OnCore functionality that rely on properly entered IRB Review Dates. For example, many sponsor invoiceable items are triggered by Review Dates.
When entering an IRB review in OnCore, you should take extra care to use the special formatting required by the Review Date field. You also need to either hit the resulting date hyperlink OR hit the TAB key to ensure that the date will be saved when you submit/close the review record.
The Document an IRB Review user guide has been updated to include alerts about this issue.