That is a good question... that is connector0pin and connector1pin. In the Parts Editor, it shows them as connected and the .fzp and .svg are labeled correctly. must be something else going on.
All the pins in your breadboard.svg are embedded about 30 layers deep... one big mess...
Actually, a good place to start when making a part from scratch is with a generic connector. If I want a part with 50 pins, I will start with a 50 pins connector then all the .svg files will be all pre-labeled.