It may be caused by the setting of "Time-record round off condition  time". Please check the settings below.

How to create

Setting " Employee"＞ Employee type setting ＞
[Edit]> Advanced features "Time-record round off condition time" of the target employee type"

Details

According to the choices for the "Time-record round off condition time" item, the totals are calculated as follows.

1. Always 0 minutes (recommended)
   All time record will be rounded off based on 0 minutes.
   
   
2. Adjust clock in/ out time-record depending on clock in/out schedule time
   The rounding of the first attendance record is based on the time (minutes) set for the clock in  schedule, and the rounding of the last leaving record is based on the time (minutes) set for the clock out schedule.
   *The time record for attendance and departure between the first and last time records are based on 0 minutes.
   
   
3. Adjust all time record depend on the clock in schedule time
   All time record, such as clock in, start break, end break and clock out are rounded based on the time (minutes) set for the clock in schedule time.

Workaround

For example, for the following settings.

Scheduled to go to work: 7:45, scheduled to leave: 16:25

Rounding unit for attending/leaving work "30 minutes"

In such a setting situation, when the clock in time is 7:40, it is not late by nature, but if it is rounded off from 0 minutes, it will be treated as an "8:00" time record and will be delayed by 15 minutes. 

In this case,
2. Adjust clock in/ out time-record depending on clock in/out schedule time.
3. Adjust all time record depend on the clock in schedule time
Please choose one.

When "Adjust clock in/ out time-record depending on clock in/out schedule time" is selected

Refer to the scheduled work time of 7:45, and rounding of 30 minutes will be applied based on 45 minutes. The time after rounding is reflected will be 45 minutes or 15 minutes. In this case, clock in at 7:40 will be calculated as "7:45". For clock out time record, please refer to 16:25 which is scheduled clock out, and rounding of 30 minutes will be applied based on 25 minutes. The time after rounding is reflected is 25 minutes or 55 minutes.

When "Adjust all time record depend on the clock in schedule time" is selected

The clock in record is also treated as "7:45", and the clock out record is rounded based on 45 minutes.