Reminders App not working

When I create a new reminder with an alarm time and repeat interval that info is not saved. After creating the reminder and touching Done, the reminder list is initially displayed along with the alarm time and repeat setting but after about 4 - 5 seconds that info disappears and only the title is displayed. No alert is ever displayed when the alarm time is reached. If I try to check the settings (using the ℹbutton) none of the info originally entered is present. This is an iPhone 5s with 11.2.6. My other phone is an iPhone 5 with 10.3.3 and the Reminders app does not have this problem.