I did take a look and yes in our database it had only one cycle, so I am a confused. I incremented your schedule one minute, saved it (I reversed the minute afterwards), and it created the correct two cycles. My only guess is at schedule creation something was different that suggested we only use 1 cycle.
Note that you have weather intelligence --> seasonal shift turned on, so in September before your next watering the system will adjust down your minutes to 18, below your maximum threshold of 19, and you won't have cycling
If you don't want this automatic adjustment you can disable weather intelligence --> seasonal shift.
If you see this behavior again just let us know and we can dig deeper.