I searched around but couldn’t find a similar issue in any bug forum threads.
The official memrise courses I am using used to appear in my profile in the “courses” section (on the website), but now only the user created ones are appearing. (I am actively using Mandarin 1 and Mandarin 2 by memrise). These courses are still present everywhere else they would normally be, just not listed in there.
I think it is because Memrise are in the process of replacing their 1 and 2 courses with revised versions. You will only see courses listed in your profile that are available in the main course list (for selecting new courses to learn).
I have something similar with my ‘official’ Spanish Courses. I have been learning Spanish(Spain)1 to 6 for a long time and then found they had revised Spanish(Spain) 1 and Spanish(Spain)2 recently. I have since started the ‘new’ Spanish(Spain)1 course to learn the new content but have yet to start the ‘new’ Spanish(Spain)2. My profile currently lists the ‘new’ Spanish(Spain)1 - plus 3, 4, 5 and 6 - but not my ‘old’ Spanish(Spain)1 or Spanish(Spain)2, because those versions no longer appears on the main course list for selection.
I think you are experiencing something similar. If you go to the course selection list and take a look at the content of the first couple of levels in Mandarin 1, I think you will notice some differences.
Not touched the website in a while, only the app. I still have this same issue actually (I recently started the brand new version of Chinese 2 and even that dosn’t show on the list in my web profile.)
That’s… weird… I actually only added Mandarin Chinese 2 (the first you linked, 1131508) like 1-2 weeks ago when I realized my previous version that I finished was outdated. (1131508 actually still shows as live for me (not faded.) The newest one (2021381) hadn’t come up back then. o_O Was that one added in the last couple weeks?