When I go to a course I’ve been taking and select “Learn new words”, what I end up in is a review session – it starts quizzing me on words I’ve seen recently.
This is happening on the website interface. (Firefox 102 on Debian Linux.) I don’t know when it started since I haven’t been on Memrise in a year or so, but I believe it’s been happening at least this past week.
(Same username on Memrise – Phyzome – but I don’t know that it’s relevant. Bug reporting guidelines asked for it though.)