Mysterious bras in the database

While combing through addresses on a data hygiene quest, I’ve run across a few interesting city names.... These were all records created via the Constituent Import Utility, and the city name came through the process as "Bra #..." (see screenshot). It’s happened on different records, from different imports run by different users.

When I checked back in the txt files with the data for these imports, the city names listed there are more mundane.

• For the import on 2017-09-15, there were no cities listed in the import data, only zip.
• For 2018-09-17, the txt files has both cities listed as ‘Miami Beach’.
• For 2018-10-22, the txt file shows ‘Leawood’ for the city.
• For 2018-12-05, both cities are ‘Overland Park’ in the txt file.

Any theories as to what these bras are and how they got in my database?

Thanks!