Her DNA search results went helter-skelter. Filmmaker Sophia Maddox broke down in tears when she and her father, Daniel Arguelles, learned from an online ancestry search that his dad was one of America’s most notorious criminals — Charles Manson. “I was obviously very devastated,” Maddox, 26, exclusively told The Post. She recalled feeling “dumbstruck” and “sobbing.” “My dad was just rubbing my back and holding me, and telling me we were nothing like him. But it was a little traumatic,” she added. Co-directed by Maddox and Alexandra Orton, the Hulu documentary, “My Grandfather Charles Manson,” follows Maddox as she looks...