Recurring tasks disappear

As far as Google Tasks service doesn't allow you to create recurring tasks, we implemented this function by our means (which is available only in Day by Day app, though the tasks are visible in web interface also).

So if you mark one task (in the sequence of tasks) as completed in the web interface, all other repeating tasks disappear. To check off a single task and keep the rest of the recurrent tasks, you should check the task off in the app (not the web interface).

If you have already checked off one task in the web interface and the rest of the tasks disappeared, put the checkoff mark away in the web interface and mark your tasks as completed one by one in Day by Day app.