While I'm no longer seeing the strange songs in my Recently Played, Daily Mix 6 (screenshot attached) is completely foreign to me. And my Daily Mix 4 also appears to be affected (I listen to songs in that genre but most of the songs are not songs I have listened to or would listen to).
Got it! It might take a few weeks for your Daily Mix to adjust to your listening preferences again. I recommend checking back on this Daily Mix in about a week. Let me know if it hasn't changed after that.