“GND” is a quite important thing in electronics, as it’s usually the reference used for any voltage. Voltages are never “absollute”, there are only voltage differences between different parts of the circuit, and sometimes you want different shades of “GND”.
The symbol you used, is not “GND” but “Earth” (Which may have the same potential, but has different meaning.
I assume you took that symbol from the “Power” library in KiCad. (Edit: Oops, probably wrong assumption. See below).
It’s name should still propagate through the netlist.
“Net-(U1-PadBJ50)” is a generic name, and KiCad only uses those if the the net has no label.
I just saw that your “Earth” symbol has 4 horizontal stripes, while KiCad’s only has 3 stripes. So I guess there is something wrong with your non-standard “Earth” symbol and it does not add a wire label to the net in the way KiCad’s own library symbols do.
You can change these symbols in one go with: Eeschema / Tools / Edit Symbol Library References and then:
- Search for your non-standard Earth symbol.
- Search for the symbol you want to replace it with.
- Click OK
- Trigger a redraw in Eeschema (For example with zoom) to update the graphics.