I am not changing the orientation of the bulb, I understand that makes no difference anyway since it's an incandescent bulb.
As you can see, the difference in the pics is that where the light went on, I connected two wires manually.
But where the light was off (and I expected it on), I plugged the ends of those two wires into the breadboard with the rest of the wires, rather than connecting those two manually.
I do not understand why this would be shortening the bulb(what an answers says is happening). It looks like a circuit to me, that includes the bulb and the battery.
The current would go from -ve to +ve, A->B->C->Bulb->D->E->F->A
And if I unplug C and B and connect them manually instead of via the breadboard, I don't see why that should make any difference. The circuit would still be A->B->C->Bulb->D->E->F->A