Why can't I set two alerts for an event on my calendar without alert times reversing?

Same on my iPhone 6 (iOS 8.3). When this happens, neither alert goes off. I missed a couple of appointments before I figured out what was going on.

Brand new iPhone 6s has this alert issue; no matter what I do the alerts duplicate each other. Maybe they shouldn't be hiring microsoft engineers. I see this has been going on over a year; you'd think they would be able to fix this glitch....could have disastrous consequences-missing an interview time, flights, etc. Apple has a new update coming.... let's hope they fix this.

Resolved my issue - in calendar, click 'calendars' at the bottom of the screen and look at the email accounts it pulls from. Make sure there aren't duplicates (I.e. one event from one source and the same (or subscribed) event from another account. Be sure you are only following one so they don't cancel each other out. Thinking of it as a giant database, duplicate entries on the same date can create issues. At least that's what happened on mine.

Hi Koala,

I think you are missing the info on this thread. Subsciption and which calender you sync it with have nothing to do with the 1st and 2nd alert setting for appointments or reminders.