Why do anemones clone?

[MikeP]

I bought a small (2-3 inches) GBTA clone from someone a few months ago. Now it has cloned itself again. I thought it might do this a some point, maybe when it was full grown but like I said it's just a small one. Is this typical? Why do they clone in the first place? And why would mine clone at such a young age?

Thanks for any info.
Mike