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There have been reports online that some Apple Music users are having trouble with their playlists. Some accounts have songs and playlists suddenly appear in their libraries, while others have their playlists disappear or be replaced. The issue seems to be limited to the iOS Apple Music app, which is most likely caused by an iCloud issue that's syncing up the wrong data between users.
Some wrote that disabling iCloud syncing and then re-enabling has cleared up the issue. You can access that through Settings > Apple ID > iCloud > Show All. Apple has had similar iCloud syncing issues in the past. But the company hasn't commented on this issue yet.