Aerocal

There is an issue.There is also a workaround. What you need to do when you are setting up is to be sure you setup the timer before you reverse the channel and it will work correctly.
You can set the timer back to Trainer activated Countdown.Go back and set the reverse to normal.Go back and set your timer to 1-time throttle and then go back to the servo setup and reverse the throttle channel.This should clear it up. Or just reset and then make sure you set the timer up before you reverse the throttle channel.It should be fine after that.