When I enter a new appointment, moments later the title reverts to "new event."

When entering a new event onto iCal, at least 50% of the time I will save the event (for example "hair appointment") which appears on the calendar--and then moments later, in front of my eyes, the title reverts to "new event" and the time changes from whatever time I had entered back to "9 AM to 10 AM" Am I doing something wrong? I share a calendar with my husband, and have color coding for all of our family members. Does anyone know what the problem could be?