If you're having problems with your installation of Better Than Wolves, or if you've woken up in the future and are beginning to doubt the nature of reality, here's the place to post about it.
I got a message on twitter about this from someone that apparently only speaks Japanese (which I don't), so I'm unable to inquire about it in the usual fashion.
I just checked it myself though, and this is what F3 + B (which supposedly shows hitboxes... never used it before) shows for BTW:
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Any ideas as to what this might be? I somehow doubt that the player's box is actually that far misaligned as I think it would be quite noticeable in combat.
I think it's a third-person graphical issue - I tried joining a LAN world with BTW installed and I get the same as you guys do above in third person, but looking at another player in first person seems normal:
I've noticed that before too. It's a vanilla bug, and seems to happen any time you have a partially transparent block surrounded on all sides except the bottom. It's actually a lot more noticeable with blocks that don't give off light themselves (e.g. buttons, levers, upside down stairs, etc.) since it makes the block look dark and not just entities standing inside it. So it's probably unrelated to the player hitbox issue.