https://techcrunch.com/2018/10/26/texas-voting-machines-changing-votes-hart-eslate/

During early voting in some Texas counties, a handful of voters reported seeing their straight-ticket votes changed to endorse the opposing party. Others reported that an issue with the voting machines appeared to remove any selection for U.S. Senate altogether.

The Texas Secretary of State’s office told TechCrunch that it has received “15-20 calls” from voters this week who reported being affected by the issue. All of those individuals caught the mistake and were able to correct their ballots before casting them, though that does not account for unreported instances in which voters did not notice the changed votes. In Texas, the Secretary of State serves as the chief elections officer.