Hey @Glenn_Huffman,
as far as I know advanced search will always include all projects (including archived ones). Here is a feedback request thread in case you ever wish to be able to exclude them.
And archived projects also have some of tags or custom fields right?
This seems very strange to me and should definitely not happen if the search is 1:1 the same.
Maybe we can assist further if you can share some screenshots of the search filter you created.
However the best way is probably reaching out to Asana support. When you do so it will help them also if you attach screenshots or even better a video showing them the difference in your saved search results and the exact same filter you created that does not seem to show all tasks.