Poor management. The training just watch the video.
The work shift always change, they usually call you to work because not enough employees on the day you don't have shift, sometimes call you not to work because they are not busy on the day you have shift. Moreover, sometimes, in the morning Manager A tell you that your shift is cancel , then in the afternoon another Manager ask you to work.
You don't know who you need to listen to, because sometimes Manager A ask you to do something, and Manager B ask you to do another task.