Delete timers from app CountDown

I like to delete timers from this app, just to clear the ones that have wrong names or are not in use anymore. There is a delete function and the timer disappears, but leaving the configuration page and return to it will show these timers again. What am I doing wrong?

Its a bug, u need to set a number first so it runs the countdown then u delete as it is running.
Hasnt been fixed but this way works.

Great, it worked. Thanx!