My (Dominion) machine rejected my ballot saying "Duplicate Markings", which was true. Because of my (stupid) ranked choice voting state, I marked the same candidate all the way across 4 or 5 bubbles to ensure that no one filled in anyone else after the fact. The poll worker said to me, "You have marked a candidate more than once. Is that how you want to vote?" I told her "yes!" and pushed "CAST" to cast the ballot. The machine accepted it. No telling if they adjudicate or reject it somewhere else down the line, but at least I have a reasonable idea that I won't be voting for someone I didn't actually vote for.