The alarm goes off at times I haven't set on my iPhone5 (last year's). WTF?

I work shifts and I set it every week on a different shift pattern. I previously thought I set it to go off at the wrong time but it has definitely gone off at a time I didn't set. The time it went off, that alarm was in the off position with no days assigned to it at the time. It wasn't the shift I had last week either (it didn't get it mixed up/carry it over from last week). What can I do?

It's a computer pretending to be a phone. Computers go wrong. Get used to it.
Disable the clock app, then reinstall it. Reset the time, then set up your new pattern of alarms.
If you want something reliable, get an alarm clock.

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