On latest channels client, the guide is showing duplicate entries with wrong time slot. This seems to just be visual as recordings work at the right time. This occurs in both beta and stable client on latest fire stick 2021.
On which channels and sources ?
OTA and Locast sources most channels
It happens that way and in the grid of information.
As you see I am getting the 12pm show shown at both 12 and 1.
You need to turn off "preserve channel numbers" for Locast if you're using both Locast and HDHR.