Created new Captain gave 4 command as off skill as you can see in first pic.
Second pic shows an Electronic Tech who had 0(6) Command as off skill that I promoted to officer and gave second job of Merchant. Now displays 2(8) which seems wrong but whatever.
Third pic with both Captain and E Tech in On Station status shows Command 2(+4) so apparently it's displaying the E Techs 2 from Merchant and the Captains 4 from off skill.
PC Win10 x64
Guns! We need BIG Guns! Then again what do I know I'm crazy!