Ghost alarm

I recently got an iPhone 7. After transferring all of my data from an iPhone 6s, an old alarm from the iPhone 6s keeps going off on the iPhone 7. I have deleted all alarms from both the old and new phone but still the alarm goes off each day. I have tried forcing the clock app to close and restarting the phone but it’s still going off at 10 am each day. It’s not a bedtime alarm and doesn’t show up under my list of alarms. When the alarm goes off and I open it, it isn’t on the list then either. How can I get this alarm that doesn’t exist on the phone to stop going off?