strange notification sound when ringing

I don't know how else to describe this aside from the fact that my notification sound goes off twice EVERY single time I receive a phone call. This only started happening after my most recent factory data reset.

It's my set notification sound, it goes off as soon as the phone starts ringing then it goes off again a second later then it stops. I cannot for the life of me figure out WHY it's doing this.

any ideas?

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