You mean when you turn the channel selector to 6 and above they make the tone through the speaker, rather than at the other end? I’d suspect they’re simply not programmed and the radio is warning you they’re empty.
The licence often is just a single channel. Here companies might program all the available ones, but it’s common to just have one channel that is on your licence, although now you might have channel one as the old analogue system and then the same frequency on 2 on digital. This happens when people add radios one by one - once complete, you stop using channel 1 and move to 2. These are dealer programmed. Some people have managed to get their version of the CPS so they can program them themselves but Motorola have always made this very difficult.