When an Attendance clock-in is marked as "unprocessed", once you hover over the "i" symbol, this means that the employee's timecard has been approved while they were still clocked in for a shift.
Here's how to solve this issue:
Unapprove the employee's timecard
Update the clock-in information
Check the attendance and timecards to ensure they are correct
Approve the timecard again once the updates are complete