More likely the film experienced some adverse conditions - either in your hands or before you got it - and that impacted the latent image retention, without significantly affecting other factors.
The equipment that is currently used for the edge printing is extremely advanced, because it is also used for the key codes on the motion picture films, and they are quite critical for the users of those products.
You never responded to my questions about the film itself - i.e. "Was the film a single roll or part of a bulk roll, and what was the Develop Before date? Did you buy it directly from a retailer?"