Let me explain because this problem goes back many years. I have my original save file from Super Mario 64 DS where I have collected 149 Stars.
Recently I wanted to replay the game so I can beat it with all 150 stars in one sitting. And I've been working on the game for like the past month. But the problem is I'm stuck again at 149 Stars collected.
The craziest part is that when I look up an online guide like IGN's guide to all the castle secret stars because my game in the pause menu marks that I have 29 Castle secret stars collected so I'm missing one. But when I use the IGN guide to kind of help me cross out which of the Stars I have collected to narrow down which one I'm missing I have collected all of them but my game only marks 149. I'm actually going crazy that even though it's 10 years later I'm still stuck at the same problem my younger self was I only sitting at 149 Stars.
What is going on? I've been making a list of every single star that I've collected as I'm playing in this playthrough and by definition I should have all 30 secret stars but I don't. Am I tweaking? This is now been an ongoing 10 year long problem where the game doesn't give me the last star.