Finds products it shouldn’t

I’m developing locally at the moment, and the filter is finding products that it shouldn’t.

For example, if no products are found in a single filter category, it returns my products. If I select the only category that currently has products and any other category, it find none when set to OR as expect. However, if all the selected categories have no products, it returns all my products.

This also happens with all other attributes in the same manner described above… can you let me know what to do to fix it?