You are trying to pivot related information, which isn't possible in a native export of a flat file format by default.
When you do this, you essentially export a row for each course completed date, with the related person on the first line.
There are a few methods of doing this in filemaker. There are products like:
that can pivot related information into the correct format for export.
There are functions like ExecuteSQL() that will gather the data from two tables in a "joined" format.
Or the popular "virtual list" technique:
This topic has been covered in the past: