When I rotate my ankle, it cracks?

I'm a dancer and I've ended up Twisting my ankle about 5 times. Yup. The same one. Anyway, whenever I rotate my ankle, or go down stairs, it cracks. It doesn't usually hurt.. Could this be because I've stretched the tendons so much that it keeps cracking over my ankle bone? Also, I twisted it again today, and it swelled up like there was a golf ball over my ankle bone, but I heard a really loud crack, and the swelling went down to about half the size... Why?