When viewing grades and sorting by a group or all participants, the display on the web page is correct.

Exporting to Excel or Text, when sorted by a group. the wrong data is acquired.
When I export to Text or Excel I get the same data. I get a list of students who are not in my course (I assume it is a group; I have not confirmed this), and thusly no grades.

Exporting to Excel or Text with all participants works fine.

I have not attempted the ODS export.