Allow contact editing glitch

I have set up screentime for an elderly family member. I specifically wanted to control Allow Contact editing as this family member was constantly blocking contacts so no one could get ahold of them.

My family member insisted the phone was doing this on its own. After turning off Allow Contact editing using screentime I discovered that going to the Recent Contacts list and pressing the question mark icon, there was still the option to Block contacts in the list. Is this a feature glitch?

At the moment, this family member has blocked everyone who regularly calls her. Is it possible the phone is blocking numbers on its own? I have checked all settings and gone as far as getting a new phone, a new apple ID, setting up all contacts and phone settings manually, changing carriers, nothing has stopped this problem. Could the number have gotten on a spam list and this is causing the problem? Or is it my elderly family member doing this?