
Unfortunately although this isn't a bug really and just a terrible design decision, there's no denying how incredibly stupid it looks. Makes me wonder who in the studio approved having crossbows on the back poking into the body.
Personally I wish they'd be on the hips just like daggers are, or at the very least rotated so they don't poke into the body. Really hate their rotation myself so I always switch to my melee weapons because I can't stand looking at these ugly monstrosities on my Drow Ranger.
I suggest sending them direct feedback here, maybe they'd listen and give them a proper placement;
https://larian.com/support/baldur-s-gate-3#modal