Q:

Behavior of a JK flip-flop

I've built a JK flipflop - specifically, the A version, from Redstone JK flip-flops - and it works - sort of. It doesn't behave as described in the wiki, and I'm not sure if the wiki description is wrong, or if I built something wrong - or maybe the Beta release changed something.
The wiki says that the type-A flip-flop is edge-triggered, and will change its output when the Clock goes from 0 to 1, or 1 to 0. For a Clock, I'm using a Switch on the side of a block (with three Redstone wires between it and the circuit, rather than the one wire in the diagram - for some reason, it breaks with only one wire between two blocks.)
When I flip the switch down, it transitions from 0 to 1 (unpowered to powered wire), which causes the Output to change, as expected. But when I flip the switch back up (transition from 1 to 0), I get no Output change (for any combination of J and K).
Just for fun, I hooked up a 5-Clock as input, in case there was something strange about switches on blocks. But again, the Output only changed when the wire from the Clock went from unpowered to powered, and not the other way.
So is that how a JK flip-flop really works? At least in Minecraft, not the real world. :)

A:

Wiki kinda made a mistake: by the "C changes from 0 to 1 or 1 to 0" it means you can design it to be edge up trigger or edge down trigger not both. If you look at the design it self you will see that the first split from input C only send pulse transitions when you change it from 0 to 1 and when you change it from 1 to 0 it's doing nothing.
So this work's alright just a little miss understanding, if you need so here the edge down design I built(just added not before the C):

I fixed this in wiki so this should be fine now.
Btw you can design both edge up and down trigger, you need to send pulse(circled in black) each time the clock is changing. Do it your self as a challenge ☺

