Why do new events in iCal automatically have reminders?

When I create a new event in iCal (whether on my MacBook, or on my iPad, or on my iPhone), iCal automatically adds 2 reminders. I have checked my iCal preferences, and "Add a default alert to all new timed events" is unchecked. It's an annoying little quirk.

This happened prior to upgrading to the new IOSes, and I was hoping it would disappear with the updates. However, it's not.

Can anyone please help me to fix this?