Hi!
Thank you very much for the details, it helps us a lot!
Logic Behavior settings:
And with exact word matches for primary and “And” for secondary.It is because of the secondary logic “AND” – there were probably not enough matches via the primary logic, and then the plugin turns to the secondary logic “AND”, which is not a whole word matching logic. I suggest either turning off the secondary logic, or using the “OR with exact keyword matches” instead.