If you are enrolled in a Catalog course and you remove your enrollment via Canvas that information isn't passed to Catalog and so it will look like you 1) never were enrolled, or 2) look like you're still enrolled. This occurs when you select the enroll button and you cannot move forward with your enrollment. During this task, you do not receive a notification saying this information. A feature idea is to create a notifier to the Catalog customer stating that you are already enrolled in this course when selecting the enroll button.