CSV exporting 0 Kbits

Testing an export to CSV process, to match BigBusiness.
This is only a 2 record test.
Setting up the field and linking to my Master table - no problem.
Everything works as expected in Airtable.

The CSV downloads but there is no data! (see image). It will not open in Excel or Libra
The Master table , with no link or lookups, is exporting fine. As are other tables.

Thanks for your assistance.