I don’t know if it’s common, but I do know when the center growth on succulents gets messed up for whatever reason will cause the succulent to do funny/cool things like this🙂.

Not common but not unknown. Some will turn crestate on occasions.

Perhaps it is Jovibarba heuffelii rather than Sempervivum. They reproduce by splitting the crown of each rosette into two or more new crowns and if you want to separate them, it needs to be done 'surgically'. Sempervivum grow offsets on stolons. Another big difference is in shape of flowers: Sempervivum flowers are star-shaped, Jovibarba has bell-like flowers, color is pale cream to yellow.. They are both monocarpic.

Btw, I believe there are few offsets there too? Then it may not be Jovibarba...Crested semps look bit different in all photos I have seen, but maybe it is beginning of a crest.

There are a lot of offsets coming in around it! I do have one Jovibarba and they are much rounder, more ball shaped than this one.

I forgot I owned this. I bought it for the crested guy.

I’m not sure if I would consider yours crested, but something is going on. I’m stickin with what I said in my first comment😁.

Nice to see you back around Pluto!