Avatars that are "originally" small sized, appear much too big. The selection highlight does display the corresponding original avatar size, an, the nameplate, and chatbox don't appear in the right place.
In my case, small avatar appeared much too big for others, but not when I'm wearing it myself, and the nameplate and chatbox appeared at "legs" level.
When I forcibly hide their avatars (gray robot), they appeared to the right size.
The same avatar that was cloned and worn "for the first time" by another person reproduced the same error.
World was Nier automata flowers,
avatars was Kittysan fennec and Kittysan fennec dark.