When multiple CDJ-3000 units are used as audio interfaces, there are cases where the CDJ installation status and the numbers such as [CDJ/XDJ(1)] don't match.
In a case like this, make settings while outputting audio and check the sound comes from the correct units.
For example, suppose the Deck1 sound comes from the CDJ-3000 unit on the right when the following settings are made while using two CDJ-3000 units.
Output Deck1: [CDJ/XDJ(1)]
Output Deck2: [CDJ/XDJ(2)]
In this case, reverse the settings as shown below.
Output Deck1: [CDJ/XDJ(2)]
Output Deck2: [CDJ/XDJ(1)]