Hi @Tino394 
Welcome to the community 😊
 
You have two listings, both descriptions are correct, but the title and pricing are incorrectly in the second listing, 
- Cardiff Double Room 2 and lounge with parking  ( accurate )
- Cardiff Double Room 1 and lounge with parking  ( inaccurate )
A double room is for two people, and the price should be for two-person.
Doube room should be the same price as the single. In particular fact, a double room means can sleep two.
 
The second listing of the title a double room, but the price is incorrect when the guest adds to two-person.
Indeed, your need to maximize to one person as identical to the other listing, and update both tags of listings too, 
“ Cardiff Private Room 1  SleepTwo and lounge with parking.” 
“ Cardiff Private Room 2. SleepTwo and lounge with parking” 
 
Although your review is excellent.Yet,a guest has a private message to Airbnb claim your listing is inaccurate and violated the housing standard.
 
Happy Hosting✌️
 Price for one person
Price for one person Price for two persons, the price is inaccurate with the title of a double room and described as can sleep two
Price for two persons, the price is inaccurate with the title of a double room and described as can sleep two