Looking at the diagram it looks like it's supposed to be like that.
Slate/red, from the transmission warning light goes to a diode that joins to the white/yellow going to the handbrake switch.
Black/white, from the brake fluid level light goes to a diode that again joins to the white/yellow.
White/yellow, from the handbrake light goes direct to the handbrake switch.
Maybe it's so you know the other lights are working?
If the transmission or fluid level switch activates then only that particular lamp will light as the diodes will only allow the current to flow one way.
Does that make any sense? I would include a copy of the diagram.....if I could figure out how to do it!