See attached sql for table structure and data
Steps to recreate
"SELECT first_name, last_name FROM users;"
2. Edit any record changing any of the shown fields
Click go ( Save and return to the last page)
The sql shown to execute is
"UPDATE `test`.`users` SET `first_name` = 'john' WHERE `users`.`first_name` = 'jane' AND `users`.`last_name` = 'doe' LIMIT 1 ;"
I find this a little misleading as it's not what the would have been run.