When I add more than one correct answer to a 'multiple correct' question type auto evaluate does not work. If it only has one correct answer it works fine (like a multiple choice).
I've refered to https://wplms.io/support/knowledge-base/auto-evaluate-quiz-not-working/ and all of my settings are correct.
Please make sure the correct answer is set separated with comas, also make sure your theme and plugins are updated to latest versions.
If the issue persists then please share the quiz url and the admin credentials with us to check the issue on your website.
PS: Please mark your reply as private while sharing the credentials.