@Jorge1656 the best approach? Tag Catherine Powell, head of hosting and ask WHY guests are permitted to do this. If all the elements of a stay are 5 stars there's zero reason to leave a lower rating overall. If ABB wants to make this meaningful for hosts they could include a prompt requiring feedback on why this rating was left or a message stating that overall rating can't be lower than category ratings.
Guests do this often. What the meaning is behind it boggles thr mind. We can theorize....did they not get good sleep? Feel slightly unsafe? Prefer a different paint color on the walls? Resent that they couldn't bring more people? Forget their meds and just generally feel badly during the stay? Feel jealous that you have property to rent and they don't? Have a death in the family while they stayed? Have an allergic response to an air freshener? Get stung by an insect? It could literally be anything that led to this rating. Or it could be an error. Until ABB addresses this glitch we can all but wonder.