Sorry, I forgot they're called "learning methods", rather than "testing directions".
Learning methods look like this:

Your course should have two learning methods: Korean to English and English to Korean. Can you check both and see if one of them remembered your progress?
I'll look into this tomorrow, God willing 🙂 Sorry for the delay -- I'm hanging out with some friends this weekend.
I can tell from your screenshot that the site knows how long you've remembered each word, so if this turns out to be a bug, you still shouldn't lose any data 🙂