There are also individuals who just miss everything regardless of who trains them and how many times something is explained. I have had a few of those at every job I have ever done. Like if a task requires a specific order they will do it out of order and forget steps after a year of performing the same task, or can't be allowed to talk to customers because they will immediately interpret policies in strange and destructive ways.

The thing is, in my experience you can't tell them apart within a few months (unless the task is mind numbingly easy.) I would stick around and see if you don't start catching some sort of a groove for the basic stuff in a month or two, the complicated stuff might require oversight for a long time.