We've received reports that when liking song from the mobile app, it won't appear in the Liked Songs on the desktop app and vice versa (liking a song from the desktop app doesn't add it to the liked songs on the mobile app). This is being investigated.
Thanks for your patience while we looked into this issue.
We’re happy to say that this should now be fixed for everyone! Just make sure your app is updated to the latest version.
If you're still having trouble, make sure to post a new thread in the relevant help board here.