Don’t worry about this claim. No one is coming to get you. Although you should dispute it, because this is a wrong accusation, and someone out there has claimed to be the creator of my music. I’m not the one throwing copyright claims at you.
Just tell them where you got it and under what license, and if they want to go further with it, they will contact me, and I can prove that I made it.
The reason this is happening is because someone has published my music somewhere and registered their release under content ID, which means they most likely has accepted some terms claiming they are the ones who made it.
I know that most claims comes from CDBaby which is a publisher/label.
I have gotten these disputes on my own YouTube videos too, and disputed it every single time, and they’ve dropped it.
So don’t worry about it!