We tested "ring gently" on our alarm on ZE620KL and could not find the same result.
Have you enabled "Ring gently"?
Could you tell us which ringtone you chose?
Please show us a screenshot of your alarm volume:
the alarm sounds again at the last sound.
> Sorry, we're afraid we could not quite understand this. Could you tell us more about what you are referring to?
Thank you 🙂