An employee recently transferred from another position, and now we’re seeing that they are continuing to receive additional pay associated with their former job. What’s going on?

Recurring additional pay is associated with the employee’s empl record, not their position. As a result, if an employee with recurring additional pay is transferred from one position to another, reusing that same empl record, the additional pay will persist. 

You should go in via the Create Additional Pay, or the PayPath Actions pages to end the additional pay.