Using moodle version Moodle 1.7+ (2006101009)
I created a new course. Set it as a Metacourse, added about 50 courses.
As admin user I added a "Choice" activity with just Yes and No options.
From the admin account I logged in as two different students and answered the Choice question for them. logged out of admin
Logged in as a teacher from one of the metacourses to check the reporting for the question. Everything OK. logged out
I realised that some of the courses I had enrolled on this metacourse should not have been so I logged in as admin and removed the metacourses.
When I checked the response for the choice option one of the students has disappeared from the results. I had expected this as I knew that one of the students had been in one of the courses I had removed.
The problem is that the link shows "View 2 responses" despite only showing one. I do need this link to be correct, though on my live server I will make sure that I do not add unnecessary courses in the first place.