Skewed cantilever - Opinions?

Send AT Customer service an email..explain your issue, assuming you bought from an authorized AT seller. They may ask you to send it to them for an inspection, they will either repair it or replace it under warranty. If bought from non-auth dealer they will charge you.

For that level of cart I would not accept it, even if straightens out in groove, the one groove wall will get extra pressure if you don't adjust azimuth

Also if you have not looked at the stylus, do that. Looking at it head on with a higher power jewelers loupe or magnifying glass. Check to see if it is also skewed along with the cantilever, if so then probably a mfg issue, these carts are hand made so it happens. If the tip is pointing straight down..may not be a problem.