Do you mean your manually added session shows at the top of your planner? That's interesting. It made me go search for my added "5:30 pm - 9:00 pm" meeting added.....it was therre 3 times....between my 10:30 and 11:00 am selections.
So, not exactly chrono, but at least I know it added it. Might be able to figure out how to trick it time-wise until it is maybe fixed (maybe just force it to be at the top of the day....) But now it makes sense why the Saturday appt showing up.
Edit: so I change my 5:30 pm to 5:30 am so at least I can find it. For anyone at esri monitoring the User Conference space....this seems to be a bug in the app ....not a major bug once you figure it out...but...