Problems playing previously scheduled files

Libretime has been used since 2021 in Ubuntu 18.04
Sometimes problems arise.

For example, each schedule was created from 1 p.m. to 2 p.m. and 2 p.m. to 3 p.m., and an hour of file was put in.

At 2 p.m., it’s normal for scheduled files to play at 2 p.m

but sometimes a file scheduled at 1 p.m. is played.

Is there a solution to this?