Hi Darlene,
It is possible, that items that does not belong to any given category, or does not have any associated taxonomy are showing up.
Make sure to disable this option as well: https://wp-dreams.com/wp-content/uploads/2016/08/18/admin/9815/admin/category-include-empty.png
Taken from this knowledge-base article: Searching within given categories/terms only
Best,Ernest Marcinko
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