Hi,
Learning mode is trying to make me re-learn everything from the start of my course instead of making me learn new words…this had never happened before. When I look at the overview, everything seems normal (interval count didn't reset).
The course is: https://mylittlewordland.com/course/455556/kor2
Help 
I probably won't be able to look into this for a couple of days, but have you tried all of the testing directions to see if you were previously learning words in a different testing direction?
neoncube I just looked around but I can't find settings that relate to testing directions.
Anyways up until now I was learning them from top to bottom of the list, same order as they were added in. And today it started going from top to bottom again, but all the way from the start.
See instead of making me learn "military", it's trying to make me learn "bath" again:
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
