No computer program / app is perfect. The app was written 'assuming' certain things. Information coming from a gedcom 'normally' has single colon before the 'heading' like Birth, Death, Marriage, Event, etc, double colon followed by date, place, person, etc. That profile has a single colon in front of everything. That is not what normal gedcom format is like.
FYI - To undo what AGC did, you can click the AGC button again, and it puts it back to what it was, as long as you made no changes since the AGC was run.