I just had a request for a same day booking (very late in the day). A check of the guest's 17 review had about half pretty negative regarding cleanliness and the state they left the places in. I'm looking but cannot see a star rating for the guest: has it disappeared along with their profile pic?
The profile pic hasn't disappeared it's just that it's now only available after a guest books (if you tick the box on your listing to say it's required) to minimise the risk of discrimination.
Luckily you have the information you need to decline this booking @Alex-and-Vaughan0
Presuming you are using instant book, I have noticed that the star ratings sometimes aren't there as well. This happened before some time ago and then they just came back . . . Glitches and more glitches are part of everyday life on Airbnb.