No that abdomen looks fine. They're usually a bit smaller after a molt anyways. Only thing I'd suggest is adding in more subdlstrate bc if your T fell from that height it's at in the pic it could get hurt. Especially a freshly molted T that's still soft.
Not sure about the growth thing. Try to get a pic of it. There are deformities, even in T's. I have a friend with a juvie GBB who only has one fang/chelicera (however that's spelled lol). It's been like that since it hatched.