autojump not actually jumping

~
❯ j wp
/Users/callumacrae/Sites/vagrantpress-master/wordpress/wp-content/themes/fundingoptions-wp

~
❯ pwd
/Users/callumacrae

~
❯ cd `j wp`

~/Sites/vagrantpress-master/wordpress/wp-content/themes/fundingoptions-wp master
❯ pwd
/Users/callumacrae/Sites/vagrantpress-master/wordpress/wp-content/themes/fundingoptions-wp

~/Sites/vagrantpress-master/wordpress/wp-content/themes/fundingoptions-wp master
❯

I'm using ZSH with Prezto. Autojump used to work, and I'm pretty sure I haven't changed anything.

This is where I'm loading it: https://github.com/callumacrae/dotfiles/blob/master/zsh/loadstuff.zshrc#L12

Then I have the following line to alias j to autojump: https://github.com/callumacrae/dotfiles/blob/master/zsh/aliases.zshrc#L4