Timing_HUD - Lap Timer - 0.1

I created a lap time monitor for time attack at Tsukuba Circuit. It is an application created by programming in LUA. It displays the current measured time, the time for each sector, and when the lap time measurement is completed, if it is the fastest time, it flashes green. Also, if the time cannot be updated, it flashes red. However, there is a problem with this program.When measuring the sector time, a comparison with the target time is displayed. If the target time is not reached, it is displayed in red as +1.000. However, if the target time is updated, it should be displayed as -1.000, but it only displays -0.000. It cannot display the actual number of seconds. It is temporarily displayed as "FASTEST". Why can't the accurate time be displayed? If anyone knows, please help me. Thank you.