Problem on Decks and Memrise with words to review calculation

There is a course I made which I would like to finish on Memrise so I logged in last night to review some words and it was showing as ‘999 to review’, I reviewed about a hundred words and the total didn’t go down and then I noticed that when I click on ‘more’ on the course it says ‘1390 to review’ - a complete mismatch. Then I decided to go on Decks and see what happens there but the exact same thing happened. Frankly I got fed up of Memrise after the changes came out and I’m going to give Duolingo a go but I still want to finish this course.

And for some reason (because I am ‘new user’ even though really I’ve been on Memrise about eight years) I can only upload one photo. memrise%203