Why isn't my Flight Review (BFR) or IPC updating my currency in Logbook?

While your instructor's endorsement is what makes your Flight Review or Instrument Proficiency Check official, ForeFlight Logbook looks at the associated flight entries to determine the number of days remaining for currency. 

If you had a qualifying event for currency, be sure to select the appropriate flight tag (Flight Review or IPC) in the logbook entry for that flight.

To add an Instrument or Flight Review Currency tracker, navigate to More -> Logbook in ForeFlight Mobile, and tap "Add Currency Summary."