time tracking intermittently way off

Greetings. Thanks for creating/maintaining/supporting this utility.
Linux Mint 19.3 Tricia
I'm running the version of timekpra from this ppa. Frequently, it works perfectly, only allowing logins to two of the four users only for the amount of time set on the days specified.
However, sometimes it shows a much higher time allotted (5+ hour discrepancy) or too little time.
I could use some assistance troubleshooting this as I have no idea where to start.
My only guess at this point is wtmp possibly acting problematically. This is a sample output from "last". (the computer has not actually crashed)

ph tty7 :0 Wed Feb 5 17:15 gone - no logout
syn tty7 :0 Wed Feb 5 16:06 - 17:15 (01:09)
syn tty7 :0 Wed Feb 5 15:29 - 16:05 (00:35)
ph tty7 :0 Wed Feb 5 15:23 - 15:27 (00:04)
reboot system boot 5.3.0-28-generic Wed Feb 5 15:05 still running
ph tty7 :0 Wed Feb 5 14:54 - crash (00:11)
ph tty7 :0 Tue Feb 4 15:09 - 12:53 (21:44)
ph tty7 :0 Mon Feb 3 21:28 - 22:02 (00:33)
reboot system boot 5.3.0-28-generic Mon Feb 3 21:26 still running
ph tty7 :0 Mon Feb 3 21:21 - crash (00:04)
syn tty7 :0 Sun Feb 2 21:32 - 21:21 (23:49)
ph tty7 :0 Sun Feb 2 18:32 - 21:31 (02:59)
syn tty7 :0 Sun Feb 2 17:39 - 18:32 (00:52)
ph tty7 :0 Sun Feb 2 16:39 - 17:10 (00:31)
ph tty7 :0 Sun Feb 2 11:00 - 12:28 (01:28)
syn tty7 :0 Sun Feb 2 09:58 - 11:00 (01:02)
reboot system boot 5.3.0-28-generic Sun Feb 2 09:00 still running
syn tty7 :0 Sat Feb 1 22:09 - crash (10:50)
ph pts/1 <IP> Sat Feb 1 20:46 - 20:46 (00:00)
ph tty7 :0 Sat Feb 1 19:38 - 22:09 (02:30)
reboot system boot 5.3.0-28-generic Sat Feb 1 19:35 still running

I've tried purging the timekpr-next install and reinstalling. This has (intermittently) persisted since Mint 19.2
Thanks and gday.