Contacts on iPad from other Apple account

I have two Apple accounts, one for my personal phone and one for my work phone. After over a dozen years with an iPhone I just got my first iPad. I set it up using the same Apple account as my personal phone, and everything is in sync except my contacts -- the iPad has my work phone's contacts instead of my personal phone's contacts. I have only ever shared my location between the two, but my work phone is not in my Family sharing or anything like that. I have verified accounts and iCloud settings on all devices. What could possibly have caused this? I will probably reset it and start over and see what happens, but not sure what I could do differently.