Is my kitten part Manx?

I just adopted two 2 month old kittens. One is a normal “black tiger,” the other is…something. She was in the same kennel as her sister and neither of them had tails. When I took her home I noticed her front legs were far shorter than her back legs, and she was much taller than my little boy. She has a very different build than him, and she runs differently. She rarely ever meows. I would feel so dumb asking the vet (the vet I take them to is EXTREMELY rude, and she also told my friend there was a Boston terrier puppy up for adoption and it turned out to be a pit bull puppy, so I do not trust her judgment.) I know a written description isn’t much help but…I don’t know!