This is probably due to slow data synchronization. You should not unlink/link your tracker in the Kiplin app, as this will cause malfunctions and accentuate slow synchronization.
Do not hesitate to restart the synchronization on your connected object's application (Garmin, Fitbit, Withings HealthMate). If you notice slowness... go for a walk, move, breathe, and your steps will arrive, we promise ;)