Wen Chang and Wen Qu can move when the birth hour changes. Compare the actual recorded time, location, calendar setting, and the hour boundary used by each chart. Print both star tables. If the birth time is uncertain, keep both charts as hypotheses instead of choosing the version that sounds flattering.
When the recorded time is close to an hour boundary, keep both candidate charts. Compare actual star positions and study records rather than selecting the chart that flatters the student.