Why am I receiving all todist notifications twice since my last update?
Please clarify, you are receiving notifications for all tasks that have a reminder, twice? And since last update, as in the update to the app?
Are these recurring tasks or a one time task? If you search for these tasks on the web version, do they have a reminder attached to them, more than one?
Please try logging out, clearing the data for the app and logging back in again.