If a retro has been completed it will affect the next check. You can confirm the details of the retro impact by reviewing the timesheet work details. Click the triangle next to a day, then click the button with three dots. Chose the Retro tab to see updates and offsets.

For example, if EIB is added as a retro, it will offset any paid or unpaid time from the shift. If PTO was applied in leu of EIB, it would credit that back as well.