You should first check your "recently deleted tasks" list at the bottom of your account settings. That will tell you if the tasks really were deleted, or if they are just hidden by a filter.
Make sure there are no filters set and that the due date is not far enough in the future that they are hidden (see "Hide Future Tasks" in account settings).
Oh, so the tasks just got moved out of their folders. This is probably because the folder was deleted, or it could be because of a third-party application that you are syncing with Toodledo, that was misbehaving.
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