Mother cat can't seem to pick up her kittens

[Chama]

It's the strangest thing but the mother cat I have right now can't seem to pick up her own kittens. It's as if she can't get a grip on the scruff of their neck. Has anyone ever heard of this before? She has been checked by the vet and he didn't mention any issues with her teeth but they do seem a little farther out then most cats so I am wondering if maybe that's what is causing the problem. I'm just worried that once they become more mobile it will stress her out when she can't go and get them.