I noticed this while reviewing a couple of my team history threads in progressive league forums. As WIS ported over old forum posts to the new format, the word "left"...or more specifically any consecutive string of the letters l-e-f-t...seems to have been deleted.
I now have lots of posts that include "y", "ies", "hander" where the words "lefty," "lefties", or "lefthander" used to be.
Fascinating to imagine what string of code might have led to that occurrence.
(Or then again, since WIS is owned by News Corp...maybe it's more sinister :)