We will take these marked rooms as an example:

In order to prevent these rooms from appearing online please:

1. Remove the room 'Bed in a 42  - Bed Mixed Dorm' with which these rooms are mapped in the portal back office

2. Click 'Clear and Refresh' button in the room map.

3. Remap your rooms. 

Please remember, that if you would like to refresh your knowledge about mapping rooms by watching these tutorials:

Start with Booking.com!

Setting up Hostelworld XML and Hostelbookers XML!

Setting up Synchronization with HostelsClub

How to set up the synchronization with Expedia