The second thing happens to me too on Chrome (mobile). This is something to tell @viet, but I bet he already knows about it. Next time you find something wrong with the site (like a design feature like this, or something that used to work and stops) there is a “BUGS” section in the WaniKani section of the forum.
I just click on it to see what it is, load the item page. Not the best solution, but it’s been okay. I like the font size being used for it currently. It’d be nice if the boxes were larger/could be wider instead.
Edit: also, mobile is only psuedo-supported.