I found the solution (or workaround I would say) in this post: Level Up Emails Behind One Level
Seems you have to go into Wanikani settings and unsubscribe to to mailing list, and then subscribe again.
I found the solution (or workaround I would say) in this post: Level Up Emails Behind One Level
Seems you have to go into Wanikani settings and unsubscribe to to mailing list, and then subscribe again.