@Kasa_Soze 

In the process you mentioned is the timer icon disappearing or is the action of the timer canceled as if you never set a timer?

@Tony The timer disapears as if I never set the timer.  

@Kasa_Soze 

I remember testing this with my HS105 when you mentioned this.

From what I found it is the turn off or on the device after setting up the timer is what quits the timer. In the case of wanting to set up a timer for several hours later, you would configure a schedule that doesn't care what state the plug is in or cancels out once the state of the plug changes.

A lamp was plugged into the outlet and it was switched on.   I was getting ready to leave and I wanted to the lamp to come back on a few hours after I left.  I set the time to turn on, left the house, turned the lamp off planning that the lamp would be on when I returned.

The fix is to turn the lamp off before setting the timer.  It was more convenient to program the timer before I turned the lamp off.