In France, electronic voting machines are used in approximately 2 % of voting stations while the voters of the rest of the country still vote with ballot papers. We decided to focus on this small proportion to check whether the electronic voting machines in use in France could pose a problem to voting efficiency and reliability. We compared the accuracy of the voting process by checking whether the number of votes to signatures were equal in each polling station. We found that the gaps between votes and signatures were, on average, four to six times higher when electronic voting machines were used by comparison with polling stations where people votes with ballot papers. We discuss some hypotheses to explain this gap.