big kids on cbbc channel

What happened to big kids showing on the CBBC channel. I'd been watching it for a couple of weeks and looked forward to it every evening, but then on tuesday, they showed the same episode as they did on monday, and now they've stopped showing the series even though i think there was an episode left (episode 13, called "finding hypnotist" where they go find mr ming).
I'm assuming they showed episode 12 on wednesday (which i missed. doh) but why on earth do they not show the last episode? and why repeat monday's one. it makes no sense. I love this show!!! Stupid bbc...