Why does iOS keep prompting my parents to turn off location sharing to me?

Because my parents are getting older, I turned on their location sharing to me (indefinitely, via invite over iMessage, as well as in privacy/location services), and this helps with knowing where they are and finding lost items, etc.  They are members of my iCloud+ family subscription.

But for some reason, it seems that iOS is often prompting them to turn off location sharing with me, and they just press "ok" not knowing what that is, etc. Why is it doing this, can anyone help with understanding why this is happening? 

It even circumvents the screen time restriction we have placed on changing location sharing settings. It's pretty frustrating. 

Thanks!