[Rayhem]

I think this is just another manifestation of the "office hours phenomenon":

1. You don't understand a concept 2. You go to your professor's office hours with a question and ask them to explain. 3. They draw some squiggles on the board and walk you through the issue 4. You say "Aha! I get it! Thank you for explaining!" 5. Two steps out the door you've completely lost the idea and need help again.

You haven't internalized the idea, you're still just attached to someone else's idea. To understand something fully, you have to really take it in and play with it; find the holes and the limitations of the model.