The Human Factor in Software Engineering

It happens amazingly often that you use an online system and even the standard use cases like "edit profile", "modify submission" or "delete submission" are evidently not tested. I won´t tell which conference system it is. But I am really puzzled that they evidently did not test the system. When I modified my submission, this created a new submission. So, I had to delete one of them. I got acknowledgement e-mails for all of these activities. While it is OK (although unusual) to ask me to confirm by e-mail my submission, it is strange that even when deleting a submission, I should confirm by e-mail that I will give this presentation. Ehm?