Roth 401k not deducted in Payroll

Summary:

Roth 401k not deducted from employee in 4/15 payroll but was deducted on 3/31.

Content (required):

Employee made a change to their Roth 401K percentage on 3/11. Roth 401k was deducted on 3/31 but not on 4/15. We did a quick pay in a development environment and the Roth 401k doesn't deduct. Does anyone have any ideas what we can check to see why it is happening? It is only on this one employee.

Version (include the version you are using, if applicable):

21D

Code Snippet (add any code snippets that support your topic, if applicable):