Anyone experience a 603 limit working and then not working?

Our 603 limits have been working all year. I have an employee who is contributing to both a pretax & roth throughout the year. They are eligible for the roth super catch up. They hit the base limit of 24,500 last month. PeopleSoft properly capped their pre-tax deduction, and rolled the rest to roth, along with their ongoing roth deduction. This month, it calculated an additional pre-tax deduction. Nothing has changed with the employee. We haven't done any reversals or offcycles. We are on 9.2, Pum 54, Tools 8.61.20. Anyone experience this?