This is a male vampire crab that i have for about 2 - 3 weeks.
I came home today and found his moult but also found that he has lost his legs. I wonder how did he lose his legs...

Information from online suggested that they only moult once a year, and its only during moulting that they can re grow back their legs.

Is there any way to have him to moult faster or help him to regrow his legs...? Or perhaps they moult more than once a year in captivity?

The first pic is his moult. Before moulting his legs are all intact.

The 2nd pic is the moult with one of the 'lost' legs

The 3rd pic is him without some legs