Is your local time ET?
I’ve been reporting what seems to be the same bug for the last 5 weeks or so in this topic:
Skim down the topic thread. Initially, I thought the bug was evident 24 hours, but later could see it was always shows airing during the 4:30pm – 5:00pm slot that were duplicated
Plexian sa2000 has posted seeing a PMS bug for shows ending at midnight UTC. The Guide display bug also repeats shows scheduled to continue airing at 00:00 UTC. I live in the Seattle area, with the local daylight savings time being UTC -0700, so shows that are scheduled to end or continue at 5:00pm PDT [00:00 UTC] are all duplicated. Subsequent shows are then displayed in the wrong time slot column.
sa2000 reported that a fix might be available yesterday (22 July 2022), but the PMS for Mac version 1.28.0.5998-adb79ff3b (released yesterday July 22, 2022) did not fix the bug.