"My Location" setting in Find my Iphone keeps changing
I have five phones on my icloud account and verizon plan. All running current v of ios (15.x). I set the "My Location" to "This Device" in the Find my Iphone settings, and then it will end up changing to another user/phone in our family. Searched forums, etc but no avail. Any explanation or fix to this issue? problem is, it switches to my daughters phone and she shares her location with friends, and suddenly I start seeing her calls in my recent history, etc. Much thanks!
iPhone 13 Pro Max, iOS 15