I have received a booking for 8 guests, they are all Polish contractors working at a nearby Golf Tournament. I have 1 double bed and 1 double sofa bed.
You are providing what you are advertising in your listing, and your guests were happy to book the beds as you advertised them- so yes they will be sharing the beds, just like any other group of 8 would.
If you're worried they haven't understood the set-up of your listing you can always drop a message to the booker to confirm your set-up to clarify as you did with me above.
They are contractors looking for somewhere affordable to get their heads down after a busy work day, rather than looking for a holiday-style airbnb experience- I would be very surprised if they were unaware of your set up and were expecting a double bed each 🙂
But I am sure confirming will put your mind a rest.