Leaking differential fluid after CV change. I needed help please

I replaced both wheel hubs. Both axles for extended travel axles and one steering knuckle that was bent.
I had someone help me that I should have paid much more attention to. And he damaged the inner wheel seal, axle seal. So I guess the question is, why is it still leaking? What do I do about it?And do you think I need to replace my brand new extended travel axle because of this little thing you see in the picture