Sweets marked with Rare! are hard to get for Pumpkin, so he will stock these only once and after they sold out, they will never appear again in his shop!
Panna Cotta may have other requirements to create.
For recipes that needs extracts, try not to use them last, it seems that the recipe(s) will not work if extracts are placed last.
Sugars may refer to Soy Flour (40-60 ratio) so, if you can't find that Ingredient, try the Soy Flour.