Punchpass' class scheduler defaults to WEEKLY classes. If you teach a class monthly or bi-weekly, you'll need to add the classes manually.
There are a few different spots you can add a single class to the schedule. The easiest is probably from the Classes page - click the little dropdown on the day you want to add a class and choose 'Add A Single Class...'
...or from your class setup in Manage Account => Manage Classes
You'll need to set up each one, but it only takes a few seconds :)