Haha, certainly not panicking!

Just want to figure out what is happening.
Yes, I have checked my alarm settings: I describe them in the original text. No, I am rather certain there is no specialalarm app. The alarm goes off as in the standard clock settings, but instead of the default sound (which it is set to on Sat/Sun) it plays a song. I already looked at ringtone and notifications directories: the music that is playing is NOT there. The songs are not randomly selected from streaming apps, since the same song plays each Saturday and each Sunday (two different songs,. though). I am going through all the sound ap settings, but so far see nothing.
Oh, the phone is an Asus ROG with Android 10. I am going to update it to 11 now.
Wait, scratch that: NOT updating yet.