Actually its just a misunderstanding, not a bug or something like that. What happened is that the game will have to recant all, if not most, of these quest orders. they are not objectives. I am sure that the reason it recants is to eliminate some extra bytes that it doesn't need in the updates. This happened in celestia as well. It might happen again in the next update levels we get, most likely. :x
That's because when the game updates, the computer hasn't received the tutorial updates within the game update, so will have to restart the tutorial tips for each wizard.
Sorry, but this is a bug. Usually the call comes from Merle Ambrose but occasionally it will come from one of the professors. I deal with this now and then.....
But if you have recently re-downloaded the game it will also do this on all of your wizards until all tutorials have been displayed again. You may still get an occasional call from the Headmaster. You can also go to your options pages and on one of them you will have the option to reset tutorials. I have mine set to critical only so I have not had that much of a problem with it since.