The last photo of Obv you posted on May 14th shows a little purple-ish blotchiness color. Maybe just the lighting from your photo but I'm seeing that color on the forehead and field to the right of nose. When I once experimented cleaning older copper pennies, I used MS70 cleaner on a few and had the same purple-ish color reaction. Maybe that is what they are seeing when they flagged it as cleaned.