What am I doing wrong? Flight scheduler

Hey there!
I’m using the auto flight scheduler to schedule the flights around my 15 medium gates. I start with setting the start times of the first flight on monday, and I try to let planes move out every half hour. But when the flight scheduler starts planning it messes everything up completely. The time set between flights is 60min.

It does not schedule flights as you set them. It schedules them as they become available.

The minimal time seperation is just the minimum, the scheduler is programmed to be a little bit random.