Pix -- they often lose legs due to stress. They get stressed so easy sometimes. Some are more nervous than others. A hermit crab with a complex?

Anyway, just keep trying. If you keep getting "bad" crabs from Petco, try Corner Critters in Leonardtown, they have them too.
Good luck! When my little one wanted a fish tank, I had no idea the work involved. I ended up killing 4 fish before I got it right. She was sad and upset, but she got through it. (Daddy did "fishy" funerals with her). Now she's got a tank with 5 fish who are doing great. Kids are SO much more resiliant than we give them credit for.
