If you think you found a bug, or an error, you should email it to hello@wanikani.com or fill out the contact form.
The WaniKani Support team does not monitor this Bugs & Errors sub category regularly, so don’t be shy, email us with as much information as you can! Screenshots, your browser version, operating system, etc., are all helpful. Be descriptive, too. What were you doing when the bug occurred? Where did you find it? It’ll make it much easier to solve the problem.
Also, if you’re running user scripts, make sure you turn them all off and can still replicate the problem. It’ll save everyone some back-and-forths by email.
If you’re not sure about whether your bug really is a bug or not, you can try posting it here and see if other users are able to help you!
The Bugs & Errors sub category is "public" in that content of this category can be found via outside search engines, even without a WaniKani account. Please don't post anything that you don't want the public to see associated with your WaniKani username.