I don't know how to answer your first question, but you can set a mileage limit to define how far you are able to travel to do photo requests. I don't think adding a cemetery to "my favorites" would make it more likely you would get photo request for that cemetery, but I could be wrong on that.
As for the second question, if you are sure that the person is buried in the Protestant cemetery, not the Catholic one, you can try to message the requester to look for the burial in the Protestant one. Just reply to the request under the Catholic cemetery map.
Would you please reply with the URLs for the protestant and catholic cemetery and let me see if there are some boundary issues that might cause a grave to be listed in one when it is actually in the other. That may be the source of the initial problem. Thanks - I do these kinds of corrections a lot.