The main thing is cm, if you are losing cm and not kgs then more than likely you are gaining muscle mass (a good thing!) which weighs more than fat, which is why you'd be losing cm (toning your body) but not losing weight. So I'd be extremely happy with that. It could also be because you are doing a lot of muscle building activities, weight training, tennis, swimming.

BTW I think you've done an AMAZING job losing those cm.