Design flaw in Dominion ImageCast Evolution voting machine
The Dominion ImageCast Evolution looks like a pretty good voting machine, but it has a serious design flaw: after you mark your ballot, after you review your ballot, the voting machine can print more votes on it!. Fortunately, this design flaw has been patented by a rival company, ES&S, which sued to prevent Dominion from selling this bad design. Unfortunately, that means ES&S can still sell machines (such as their ExpressVote all-in-one) incorporating this design mistake.
https://freedom-to-tinker.com/2018/10/16/design-flaw-in-dominion-imagecast-evolution-voting-machine/