Reason : If an employee comes before their Shift Start time, you can find their swipes in the Biometric System Database, not on greytHR.
Ensure the Shift In Margin associated with each shift based on their shift timings.
The Shift in Margin is the specified time from which an employee begins work for a specific shift.
For example, the 09:00 - 18: 00-hour shift, if you allow a 1-hour shift in margin; the swipes will be captured on greytHR employee swipes page only from 8:00 onwards.
Contact support team for more details about the Shift configured on your greytHR account.