One thing that prompts MANUEL ADJUDICATION is a bleed thru from the other side. For example, if one were to fill out a ballot with a Sharpie/marker it would bleed thru to the other side. When the scanner notices a mark where there is not supposed to be, caused by the bleed thru, it does not accept it and sends it to adjudication. This is thru the scanner/computer which sends it to an actual human that is then able to "correct" the error. Which then they can change in their favor Fun fact: when I voted in the 2020 election the ONLY option that was given at my location were Sharpie's. It wasn't until after the Election that I realized what they did