@Craig638 Updated what? Your title is Double Room, which means it is for 2 people. As I said, if you only want one guest at a time, change the title to something like "For solo travelers", as mine states, or " Private room for one guest". Whatever you do, don't say Double Room.
And don't mention an extra charge for a second guest. You don't want to encourage guests to ignore your booking settings.
Either choose to host up to 2 and change the guest count to 2 or stick to one and make that abundantly clear.
As it stands, your listing is confusing.