Two phones both showing calls, already set not to
I have a work phone and a personal phone both on the same Apple ID. I have them both set only to ring and receive calls/Facetimes made to and from their own individual numbers. However, today the call log on my personal phone started also showing all of the calls from my work phone, and vice versa. Until now it wasn't doing this. How do I stop this from happening??
iPhone 8, iOS 13