Nothing to be concerned with - perfectly normal situation. It means that you do not have any System Quick Keys assigned for the positions where the dashes appear.
You may see something like S0: 1 2 3 4 5 6 - - 9. That represents System Quick Keys 1, 2, 3 ,4 5, 6 and 9 have been assigned and they are enabled/turned on. There are no System Quick Keys 7 and 8 (where those dashes are).
If you see asterisks (*), that means the System Quick Key is disabled/turned off. For example: S0: 1 * * 4 5 6 - - 9 means that System Quick Keys 2 and 3 are disabled/turned off.