When first time the sensor (light barrier in most cases) is crossed, DS shows already 1 lap when PCLC shows 0 laps only. With all further laps both run in parallel but are always different by one.
This some times is confusing, when entering the laps and fraction of laps after each segment in an Excel sheet. Would it be possible (maybe as an option - check box ...) to let PCLC also start with 1 such that DS and PCLC effectively show the same number of laps?
It's only a nice to have and by no means a bug. Maybe you can consider this some time ...