Hi QueensCounty,
We suggest making sure your iPhone is running the latest software version. You can do so by tapping Settings > General > Software Update:
Update your iPhone, iPad, or iPod touch - Apple Support
Then, try deleting all of your existing alarms and using the steps below to set a new one:
1.) Open the Clock app, then tap the Alarm tab.
2.) Tap the Add button
.
3.) Set a time for the alarm. You can also choose one of these options:
Repeat: Tap to set up a recurring alarm.
Label: Tap to name your alarm.
Sound: Tap to pick a sound that plays when the alarm sounds.
Snooze: Turn on to see a Snooze option when the alarm sounds.
4.) Tap Save.
How to set and change alarms on your iPhone - Apple Support
Take care.