Clean interface just a small obstacle – MultiTimer: Multiple timers Review

The app is overall so helpful to have designated time for things you wanna do. It helps you to be productive and motivated to get things done. But one con for me is everything mine the timer ends I CANNOT hear the alarm or get an alert. So I have to log into my phone to check if the time ended. Is this suppose to happen? How do I fix this?
Review by ag.naz on MultiTimer: Multiple timers.