Repetition settings of tasks keep disappearing

I have set up several tasks to repeat (I'm still in trial mode having just set up an account - I'm testing to see if I want to make the switch permanently and sign up for pro). However the settings I enter for repetition keep disappearing. When I first enter them, the task shows up in week view with a little repeating sign, and the settings are there. But later (eg. after I add another task), the repetition has disappeared. Any idea why? Logging out and back in did not help.