UGH, I am so sorry, AS! All that work! I wonder if keeping them in storage does anything to keep the completed tasks? That has happened in other events for me. If I placed them in my kingdom, it reset. Whatever the issue, we should not have to *figure it out* on our own, or bang the respective jukebox of this game with our fists to get it to work properly.
If you were in fact able to keep the items, then I might keep going just to craft them and chalk the rest up to a loss and move on.